Yeah, the junk food catches up with you eventually, about the mid-50's with me. Judging by how many hospital bills are caused by it, it is about as bad as smoking cigarettes. With Health Care costs becoming the number 1 factor in having employees, it would seem that companies would be screening people according to their dietary habits.
I mix it like you say. Somtimes I dilute it with water, so its like a thick slurry and drink it like a shake.
Since you are in the market for ideas, another neat one I discovered, is to mix coffee and those "meals in a can" they market to dieters and elderly people. It makes a high protein( a tasty) cafe-au-lait sort of drink. Actually I came upon the soy powder and applesauce as a way of getting the "canned meals" protein a bit cheaper. Most of those canned meals are soy-protein-isolate, vitamins, and some flavor. The soy-protein-isolate can be bought in quantity very cheap on the net.
I'm not really a human, but I play one on earth.