More to explore:
Time-out bottles. Fill a bottle with 3/4 water, one bottle of glitter glue, & ultra fine glitter. Then send this bottle with your child to timeout and they can watch it settle to calm them.
Sensory bottle ideas
Calming bottle. Love it.
Calming Bottles. Need to try these!
Calming bottles - things for kids to look at while calming themselves down.
I think these are so cute! I am not sure if they work for you but I want to do this with the girls when they are older.
Calming Glitter Bottles