Instruction: Generate an answer to the question by utilizing the information contained in the document.

Input:
Question: How much water do you put in this thing?
Document: Very happy with it just wasn't sure how much water to put in but found by experimenting  recommend for butter lover's!! !
Simple, and blends pretty much into any decor style. Does exactly what it should do, and small enough for small kitchens. We don't use a lot of butter so I typically only put about 1/2 a stick of butter in at a time, and change water frequently.
I put too much at first and the butter slid out when I was taking it out, but that was my fault. I also love the simplicity of this. Very well made.
It's the most amazing thing, butter keeps soft and delicious and you only have to change the water every few days!!!Unbelieveable!!!! !
The message you should be getting here is "sometimes the butter slides out" but its no big deal. Digging the butter out of the water in the crock and pressing it back into the cup is NOT why I bought the thing. I say that qualifies as "doesn't work well".
This is the neatest little thing I have come across in a long time. You can have nice spreadable butter all the time without putting it in the fridge or warming it. All you have to do is add water to the bottom half every three days. And replace the top half , that contains the butter ,and it stays fresh. Believe me !! !
I love this butter keeper! It makes toast so much faster and enjoyable. I have had no problems with it, as long as I remember to change out the water occasionally. Great product at a great price!
Keeps my butter fresh for as long as it takes me to go through it (never longer than 2 weeks) with periodic water changes. When I've cleared out the bell, I just toss everything in the dishwasher to get cleaned and sanitized. No problems with mold, mildew, or anything else. Pretty simple design, there's not much to go wrong.
I recently purchased two of these. One for myself and one for my son. I love it! It's so nice to have butter at spreadable consistency for every day use. It's convenient and easy to change the water in daily to keep butter fresh. I've never had a stick of butter long enough in it to worry about spoilage. I hope others enjoy this as much as I have.
A friend of mine has a butter crock and I've been coveting it for awhile. But I don't eat much bread and therefore, have little use for butter. But when I saw this one for less than $10, I couldn't resist. I should've known better.The main problem is that the fit between the two halves of the crock isn't tight enough to get a good seal when filled with water.
Answer: Doesn't need much--1/2 inch or so. You can kind of hear the "airtight seal" when you put the dish in and out of the water.