I've just discovered the wonders of gellibath, it's amazing!
It's about £5 for a packet, I got mine in Tesco a few weeks ago (2 for £8). So this might not seem the cheapest activity but it's worth it.
I've used my cat litter activity trays and put 2 litres of water in each. I have then added 10g of the gellibath powder. The gellibath comes in a 200g pack so there is enough for 20 trays (works out cheap after all!)
I had 2/3 children sharing a tray and this worked great.
http://www.gellibaff.co.uk/
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