Lava lamps - plastic bottle + vegetable oil (half fill the bottle) + water (fill the rest of the bottle + 10 drops food coloring + alka-seltzer (broken into pieces, placed 1 at a time into the bottle) = lava bottle
20 Fun and Creative Crafts with Plastic Soda Bottles
Calming bottles - these sensory bottles are great for little ones to explore and for preschoolers to use during a cooling off period. Water bottles with small amount of water poured out. Glitter glue, loose glitter, jewels and superglue to seal cap.
These are just a few different kinds of Sensory bottle ideas make your own variations. Make sure to ALWAYS seal your bottles securely! Place a few (NOT FOR SALE) in your kids area to keep them amused whilst parents shop!