An electrolyte solution, like pedialyte, may help rehydrate him. I'm not sure of the ratio, I will look around the forum and see if I can find it. Make sure any water you use with him is dechlorinated or you'll have even more issues, also, it should be about chin deep, deeper than that and he could drown in his current state of weakness. Thanks for trying to help this little guy. You can offer him the crickets you find, but I doubt he will eat at this point.