Where can I buy water crystals? (turn to gel)?

I need to get water crystals, which is something that when drenched in water it absorbes it and turns to gel. Where can I get this? I have checked bed bath and beyond, bath and body works, and joanns. Where can I get this??? I need it for this:

http://www.allfreecrafts.com/homemade-gifts/fishbo...

Update:

I am located in the south united States. Also these are called polymer crystals.

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