Get a friend to check in on them every few days. What I've done in the past to make it easy for them is sort of "pre-package" some crickets in disposable tupperware containers with cricket food so they can just open the container into the cage in order to feed the leos. Just have the friend stop by every 3 days or so to give them some crickets and make sure the water bowl is full and they'll do fine.
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