Crickets do not have a long lifespan anyway.But to keep them alive,they will eat fruits,veggies,bread and even fish food.Give them water too.But put it in the cap of a pop bottle or some other little dish like that and put cotton in it,so the crickets can't drown.
Also do not overcrowd the tank or thing you keep them in,because they will cannibalize eachother.
Are you planning on keeping a few like that? If you are just going to be giving them to your gerbils every couple weeks,it may just be easier to get a couple when you need them.Crickets smell bad too and I wouldn't wanna keep them longer then I had to...I used to keep them and well they stink.
* Lisa *
* To the world you are ONE person,but to a rat you are the world *
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* It's a rat thing...you wouldn't understand! *