I hear ya on the stranger in the house thing! You really need to have someone you trust all the way around. I suggsted it in case you got desperate.
As for the food, well, maybe they could go that long with no food but they will be in a weakened state and more susceptible to problems. But more importantly is that he absolutely could not go without water for week.
even if your friend came in every other day or so and made sure the water, temps, lights are ok and throw some crix in a cup. When I went away I put everything I could on timers so Deb only had to worry about feeding and misting. Not sure where you live, but I had a backup heating device in case we had a power outage.
One last suggestion for your friend. Try to have him come over so you can show him what to do and not just leave a note - detailed or not. it may also give him a little soft spot and he might find himself checking in everyday. Oh, and DON'T FORGET to leave a number where you can be reached as well as your vet't number.
OK, "mother" lele is done 
have a good trip!
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0.1 veiled - Luna
0.2 green anoles Jaida & Jetta
0.1 brown anole - Jamaica
0.2 house geckos - Gaia & Tia
0.2 felines - Kyndra and Líta