I'm living by my Isopure right now. Isopure zero carb (get the ones in the bottles, the powder is NOT the same). It comes in 8 oz and 20 oz bottles. The 20 oz bottles are 40 g of Protein. You can use it to make Jello, or freeze it into ice cubes for your sipping Water, or just drink it straight. I purchase it online, but you can get it at Super supplements, GNC ect...There are about 6 flavors. I like the apple melon and coconut, but the tea is good too. Plus its nice to have the convenience of a ready to go product cold in my fridge.
In addition, you can try the unflavored Protein Powder to add to broths for a change.