Group activities for preschoolers with autism?

I work with young children that have autism (most are 2-4). We are wanting to do some large group activities that are primarily just fun. Most of our kiddos are not verbal some will speak in 2-3 word sentences. Most can't do more than 1 instruction at a time (raise arms, clap your hands etc..) Games don't... show more I work with young children that have autism (most are 2-4). We are wanting to do some large group activities that are primarily just fun. Most of our kiddos are not verbal some will speak in 2-3 word sentences. Most can't do more than 1 instruction at a time (raise arms, clap your hands etc..) Games don't really work for us. For us process art projects work best (finger painting rather than making a cute pinterest craft) I'm looking for some fun science, sensory activities, music activities, process art. Plus things that can be done on a very low budget like a $10 or less for a week's worth of activities. Our parents have a hard time bringing in requested materials like (toilet paper rolls, boxes, etc). We have 13 kids so it can be hard to come up with enough supplies.

Things our kids have loved:
bubbles
painting
playing with water
making snacks ( have kids with nut, milk, gluten, low sugar diets so this can be tricky)

Any ideas?
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