I see a craft store trip in the near future. (Bottles are aquapod water bottles). For an ocean bottle use half water & half baby oil with a few drops of food coloring, for a slow motion bottle use light corn syrup.
MAKE IN GROUP FOR SELF-SOOTHE BOX Ideas for various squishy balloons. If E could take a walk outside with an adult and fidget with one of these, would it be enough to help him reset? Also, how about a matching activity where he would guess what is inside?