Does anyone know if its safe to use water...
Does anyone know if its safe to use water treatment tablets/drops in these?
Absolutely! The material, though flexible, is very similar in performance as other plastic bottles like Nalgene. There is zero taste whether you leave the bottle in the sun or use hot liquids. You can also place in the freezer (making sure you don't over-fill the bottle) if you so desire. They are incredibly durable, light, and will not absorb chemicals, tastes, etc. Hands down the best ultra-light backpacking water bottle on the market!
I have used the chlorine tabs in my Platty without any issues