Discovery bottles- 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.Make sure to ALWAYS seal your bottles securely with hot glue around the top of the lid.
Sensory Bottles | AWESOME explanation of the What, Why and How! Start of a new series, MUST PIN!
Discovery in a Bottle: I decided to also use the Voss water bottles. It is worth it for the long term use of the bottles. They are very sturdy, no ridges like most bottled waters, and are easier for little curious minds to view what's inside them.