This is a little trick I learned awhile ago, it's very simple and will cost you a lot less than MAC water based mixing medium will!
All you need is:
Glycerin, found at any drug store. I bought mine at a Rite Aide for $4.99 (6 fl.oz).
Small cup, container, whatever you would like to store it in - take into consideration how much you want to make.
Water
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