I use the shot protein and it works very well, and it comes in a ton of flavors. these are the ones I use: Super Protein Shot 26gm protein, New Whey liquid protein 42gm, and Profect protein supplement 25gm.
They are a a bit sour but a lot easier to go down, flavors make a difference my favorites are blue raspberry, fruit punch, and passion fruit.
ensure has a dietbetic counter part with protein no sure of the name.