Most cleaning kits come with bottles that range in size from 1 ounce to 2 ounces. The idea behind the kits is to give you the right amount you need of each solution so they all end up being used in about the same amount of time. You then will have a choice to make – do you buy another kit, or do you buy the bottles separately. You won’t really know the answer to this until you start using the solutions and see which ones you really like the most, and continue to purchase those. Most oils and greases do not expire or go bad, so you can’t really buy too big of a bottle if you purchase them separately. Just remember, the idea behind a kit is to give you the items you need in the right proportion that you need them – it makes it very easy to know how much you need of each solution.