No problems with celiac. Just a teaspoon, water and down does the trick. Do you want some kind of shake? Egg white protein, coconut milk, coco and stevia are not bad for low-carb post wo shakes. Ditch the coconut milk and add berries for a carb protein combo. That's about as fancy as I get!
You should have a shelf life of about a year. Creatine does oxidize...buy it in amounts you will use in about a month for best freshness.
"Survival will be neither to the strongest of the species, nor to the most intelligent, but to those most adaptable to change."