I would only count things as a meal if it has protein. Popsicles would be considered fluid only. At four days post op, you really don't have to eat 3 meals a day, etc. You just have to sip constantly while you're awake in order to hit your protein and fluid goals until your tummy heals to the point that it can accept "normal bariatric portion meals" I would just focus on sipping every 15 minutes when you're not eating. The only thing that would count as a meal AND fluids would be something like a protein shake, protein water or broth with unflavored protein powder that was added to it, so anything that has proteins and is a fluid would count as both.
I don't batch and freeze currently, so I'm not sure about containers. I'm not sure how freezing protein shakes would go. I have a feeling the texture would be different or they may separate.
Have you tried the Fairlife protein shakes? They don't taste like a protein shake. They just taste like a lightly flavored milk to me. Strawberry reminds me of Strawberry Nesquick, but not as strongly flavored.