See if you can have sugar free Popsicles at all or beef/chicken broth. I got bullion cubes and they say they have 0 cals. Also, I asked if I could blend my Protein with ice and they told me it was ok. Makes it seem more filling and crunching on the ice makes it feel like I am actually eating.
Also, I have been adding flavoring extracts to my shakes. You can find them in the baking aisle at Walmart by the spices. Lots of flavors... banana, almond, cherry... They are calorie free.