My children always love a good baking soda activity, even my 7 year old still gets excited at the prospect of some fizzy fun. This took literally minutes to prepare and all you need is baking soda, vinegar and food colouring.
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What you need:
Bicarbonate of soda/baking soda
Mix some water with the bicarbonate of soda, I used a whole packet of bicarbonate of soda and just added water slowly until I had a very thick paste type mixture.
Add a few drops of food colouring, mould into rock shapes with the bugs inside and leave to dry for a few hours.
Once the rocks have hardened, add vinegar very slowly and watch as they fizz and dissolve. We used a pipette which is also great for helping with fine motor control.