Only use Gatorade or G2 bottles for the sensory bottles they are a heavier plastic so they hold up better and keep a unison look so everything looks good. They come in different sizes you can find smaller ones for small hands if you need to.
Make sure to ALWAYS seal your bottles securely! I cannot emphasize this enough. Unless you want your bottle opened and the contents poured out. SEAL IT… with glue. Duct tape can be peeled off by a determined kiddo. Glue is much harder for them to open up.
Rainbow Dry Pasta Bottle
Fill bottle with colored pasta (Use this recipe to make colored pasta) layer the colors in any way you want. I just did traditional rainbow layering above. making an ombre colored bottle could be really cool though. I left some room at the top so the children could shake it up and move the colors all around. I also use different types of noodles.
For a list of ALL my amazing DISCOVERY BOTTLE IDEAS click the link or the image below