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Sensory bottles! They used Voss water bottles. Not sure where to find them but any water bottle will work. use mineral oil for a way to slow down the materials in the bottle. I usually do 2/3 water to 1/3 oil. Can also do just rice and small objects for I-Spy bottles.
Directions for preparing water-bead sensory bottles along with Montessori-inspired ideas for using a rainbow of water-bead sensory bottles with babies, toddlers, and preschoolers
Sensory bottles are a fun and easy craft for you and your child to make at home. This craft will require adult hands and close supervision to create. We have about a dozen sensory bottles in our classroom. The children really enjoy playing with them.
Sensory Activity Fun with Water Bottles | Water bottle crafts and activities are fantastic for children with autism or sensory issues. These crafts encourage creativity, peer interaction, fine motor development, and provide sensory and visual input. Below are some creative ideas to that you can use to create fun activities with your kids or students with items you may have around your home or classroom.
The ultimate resource for sensory play on In The Playroom - Sensory bins, sensory doughs, sensory paint activities, sensory bottles, and more
Another "calming jar" idea: your kids shake the bottle and then have to watch it till the glitter settles to the bottom. This one has the advantage of being in non-breakable plastic bottles. Also, you can superglue the lids on, so the kids don't open the bottles and drink the glitter glue while they're "calming down."