I'm wondering if we're allowed to bring clear liquids on the plane with is? If not, did you bring a powder or some kind of protein to mix with water? What would work for this?

I brought packets of propel zero to mix with water. But security actually let me through with my 2 bottles of pedialyte after I told them I just had surgery and they ran it through their little scanner to verify it wasn't explosive. You could also purchase something once through security. I saw vitamin water and muscle milk in the little shops. On board, they usually serve apple juice and tea.

I also brought powder drink packets of the Propel Zero as well as some generic Crystal Lite packets. I was initially thinking about bringing a premier Protein shake with me, but opted against it for two reasons. First, TSA doesn't have to let it through without a medical note/Rx, (though as the above poster saw, they aren't all super-strict, it's luck of the draw). Second, I was jumping the gun, as I was on clear liquids for the first week post-op. So, no point in even worrying about it.

Instead, I brought some individual packets of chicken and beef bullion in case I needed it. All said and done though, I just stuck to my propel.