Gainerguy, I assume you are drinking that much milk to gain weight? Start drinking half and half instead. It tastes much better (especially if you throw some chocolate sauce in it) and it might not give your cum that sour taste. But yeah, what others have said - two or three glasses of a fruit juice can really improve the taste of your spunky. I have a glass of orange juice in the morning and I also drink grape juice to mix Creatine with. ALSO, I have found that drinking lots and lots of water (which is what you should be doing anyway) really gives your cum much less of a taste at all. You could go that route too.
Don’t quote me on that GNC. They might not have it for you now that I actually searched and couldn’t find it. You might have to find a vitamin store. Your mall SHOULD have some sort of vitamin world or vitamin shoppe in it. They all usually do.