Cutting milk with water?

Cutting milk with water?

Does anyone know the "recipe" for cutting milk with water. In particular 2 per cent milk. I usually don't buy milk (I let my son buy it) but when either one of us buys it- we buy 2 per cent. He drinks it like it was soda or water or whatever. I only use it for cereal. Trying to make things stretch farther so wondering about cutting the milk with water. I already do this sort of but I don't want to do it too much. My son would find out what I'm doing and have a fit.
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pointe shoe

pointe shoe