This would be a cute craft project for kinders: Oceans in a bottle!
The Primary Pack: Calm Down Bottles for the Classroom
Ideas for various squishy balloons. Also, how about a matching activity where he would guess what is inside?
Fiestas Infantiles Pijamadas
DIY Sensory Blocks - a wonderful sensory toy for your little one, but wouldn't they be GREAT in speech therapy? Close your eyes, touch, now describe how it feels. Use your best vocabulary words for describing!
Baby Sensory Board
10 Fun Things to do with your 8-10 Month Old Baby | The Train Driver's Wife
pipe cleaners in a spice jar - I actually made one of these for my older daughter and she LOVED it.
Busy Board Baby girl Activity Board Sensory by Woodledoodleshop