@mcl123 Drink milk. Buy it by the gallon, put in a smaller container for work or travel.
Ice cream has no protein.
Skim milk has identical protein. If you don't like the taste, try adding a "Crystal Light" sort of drink powder to it. Or the Mio flavoring. Put the powder in a bit of water first, otherwise the milk may glob up or curdle. If it does, drink it anyway.
It's possible to culture skim or nonfat milk to kefir, or yoghurt, etc. if your objection is lactose intolerance.
And of course, a drink powder or low calorie sweetner, or Mio can be added.
I am aware of the "too much calcium" thinking. Too much calcium is a lesser problem, compared to too much fat, or not enough fiber. Yes, milk has no fiber, but it's easier to digest.