Protein timing?

in general, when a protein powder is mixed into water, how long it will take before it expires? cause what im trying to do is sip on protein for the whole day, but i dont know which protein has the longest life span once mixed into liquid. or is all protein capable of it?

i want to mix say 150grams of xxx protein into a liter of water n just sip on that through out my day, with another one to sip on at night. what proteins can i do that with?

Once mixed with a liquid, treat it as you would a glass of milk.