Question: things to do with water bottles?
Answer: Clean your drain. With just a few simple incisions you can avoid the dreaded smell and toxic fumes of drain cleaner and make your own de-clogger.
Wasp trap. ... 
Paint dabbers. ... 
Glass pasta (or anything) holders. ... 
No-sew zipper bottle containers. ... 
DIY spray paint container. ... 
Sprinkler. ... 
Dog toy.