I LOVE sensory tubs! When my daughter just needs a break or I do lol it great entertainment. To feel the rice run through your fingers is such a calming feeling. H "makes sand castles" lol and pours, dumps, scoops,and plays for a long time. Great for when other kids come over. I am going to get a little dust pan and broom to go next to it so she can learn responsibility to clean up the ones that fall out too.
I make it in a gallon size ziploc bag. I add 4-5 pumps of hand sanitizer and 8-10 drops of food coloring and mix in closed bag. then let it sit for about 12-24 hours it is actually ready before that but I usually make things like this after I put my little one to bed so it sits overnight. good luck it is supper easy.