The key to this filtration technique is food-safe activated carbon, which can be bought at your local pet supply store. Activated carbon is a substance created to have holes in it smaller than the eye can see, making it ideal for filtering out fine impurities from a substance. You'll want at least 3 cups (1,020 g) of this for filtering. It should be relatively cheap to purchase from your local pet store, or you can buy bags in bulk from online retailers for even less. In addition to your activated carbon, you'll also need: Cheap vodka Coffee filters Colander 2 bottles/containers (larger than the amount of vodka purchased) Funnel Strainer/colander Straight from the bag, your activated carbon will have some dust remaining on it from processing and handling. You don't want this residue getting into your vodka, so you should remove it from the carbon first by running your carbon under water while in a colander or strainer. Then you should: Place your activated carbon in a coffee filter. Cone shaped filters that will roughly match the shape of your funnel will make the filtration process easier, but standard coffee filters will work as well. Put about 2 inches (5 cm) of food-safe activated charcoal into your filter, and then place the filter inside your funnel. Place your funnel firmly into the mouth of your container so that it is stable and will not fall over. Then pour vodka into your funnel until it is of the way full, though you'll want to keep the level of your vodka from going over the top line of your filter. If your vodka rises above the filter, there's a chance that it will trickle between the filter and funnel without receiving the purifying effects of the activated carbon. It may take a considerable amount of time for your vodka to drip filter through the carbon into your container. Filter your cheap vodka until none remains. When the level of your vodka begins to diminish in your funnel, you should add more to continue the filtration process. When finished the first filtered batch: Move your funnel with its filter and activated carbon securely into your second container to prepare for round 2 of filtration. Run your filtered batch through your carbon several times. The more times you pass your vodka through your activated carbon, the more impurities the carbon will soak up from it. Since fresh activated carbon filters at a better rate, after your second or third filtration cycle, you may want to change your coffee filter and activated carbon. Don't forget to rinse your fresh activated carbon to remove any silt or dust from it before using it for filtration. You should aim to keep your vodka exposed to the activated carbon for a minimum of 5 minutes to ensure the best results.
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One-sentence summary -- Gather your filtration materials. Prepare your activated carbon. Drip filter your vodka into your container. Prepare for round 2 of filtration.

It's possible that your brother just simply doesn't understand why privacy and personal space are a big deal. Begin by talking to him and explaining why it bothers you that he goes through your things. Ask your brother how he would feel if you were touching his personal belongings, rearranging them, and possibly breaking them. Chances are, if given a moment to think, your brother will recognize that he wouldn't like it if you were doing these things. This will encourage him to reevaluate his behavior. Tell your brother that when he gets older (like you!), he will want his own space. It's possible that he doesn't understand that it's not appropriate to go through someone else's things without asking first. Yes, sharing can be a great thing, but it has its time and place. If the problem continues, consider asking for a family meeting to discuss privacy and personal space. However, don't create a situation where your brother feels attacked. Instead of accusing your brother of invading your space, explain how you feel when your space is invaded. In other words, stress your feelings rather than his actions. If your brother still doesn't want to leave your stuff alone, you could decorate a container or box and give it to him. Tell him that this is a place where he can collect his favorite things. You can put one of your brother's prized possessions in the box to get him started, and help him find a special hiding place for the box. This way, you will be teaching him about privacy and personal belongings in a way he can better understand. If your brother constantly messes with one or two of your belongings, see if there is somewhere else you can put those items. You could keep them in your locker at school, at a friend's house, or in your parents' room. For instance, if your brother sneaks into your room to play with your guitar, ask your music teacher at school if you can store your guitar there. You could also ask your parents if you can keep the guitar in their room when you aren't using it. Your brother will be less likely to sneak into your parents' room. If your brother is constantly snooping in your room, and you've tried everything else, explain the extent of the situation to your parents. Ask them if they would allow you to lock your room when you are not home so that your brother doesn't go through your things or break any of your valuables. Your parents might be hesitant to allow you to lock your room, since you would be locking them out of your room as well as your brother. Be sure to say that you want them to have a key so that they can access your room if need be when you are not home. If you share your room with your brother, you obviously can't lock him out of your room, because it's his room, too! Instead of asking for a lock on your room, you could ask your parents for a lock box where you could store the important things that your brother keeps messing with. Again, emphasize that you would want your parents to have a key as well so that they know you aren't trying to keep secrets from them. If your brother steals your phone, laptop, or ipod, you can password protect these items so that he cannot use them. Also, be sure to secure your online accounts (such as gmail and facebook) by changing the password regularly. Maybe you have a shared, family computer instead of your own laptop. If your brother snoops through your emails or social media accounts, be sure that the passwords aren't saved on the computer and that you have to manually type in your password to access your accounts. If your brother reads your school work on your shared computer, consider saving your work on a flash drive or in a password protected cloud storage platform, such as Google Drive or Dropbox.
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One-sentence summary --
Help your brother understand. Take away the temptation if possible. Ask your parents for a lock. Put a password on electronic devices and online accounts.