Activities for kids with disabilities on a very hot day?

Hello all, this week I'm helping entertain some family-friend's kiddos. It'll be 96° out, so I'm looking for a mix of mainly indoor activities and water activities.

Kids range from 12 to 2, including one who is wheel-chair bound and another who is non-verbal.

Activities we have planned so far are tye-dying t-shirts, slip-n-slide, and giant bubbles.

Thanks in advance!