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. They come in different sizes you can find smaller ones for small hands if you need to.
Make sure to ALWAYS seal your bottles securely! I cannot emphasize this enough. Unless you want your bottle opened and the contents poured out. SEAL IT… with glue. Duct tape can be peeled off by a determined kiddo. Glue is much harder for them to open up.
We made Sensory bottles to show the different properties of blood.
Red pony beads
white pony beads or white buttons (slightly larger then the red)
Glitter in silver or red
Simply add all the ingredients to your bottle. There should be lots of red blood cells (red pony beads) I think I used 500. to fill your bottle around 2/3+ to the top. the plasma (water) goes to the top. Next White blood cells (white beads or buttons) which are larger then the red but fewer in number. The glitter represents the platelets.