I'm lucky in that my youngest brother is willing to help out if i should decide to go on a vacation (which i'm planning on doing later this year).
What i wanted to tell you about is that i bought these really cool water bottle bowls. Its a bottle that screws into a base, so you just fill the bottle, screw it in place then flip it over and vola, water for 2 weeks LOL. Granted i have to change it every few days cause my geckos insist upon walking through the water usually dragging something into it (mostly mealworms and yes i've watched this happen.....saved the worm in time before it drown LOL). But if ever i was in your situation i'm sure the water problem would be solved.
Now as for food.....i have 14 leopard geckos that lets say eat 15 mealworms/day and thats being conservative....so 225 mealworms/week. I could put out enough food for the leos but when it comes to my crested geckos i'd have a problem.....as i feed on an alternating schedule of CGD, fruit baby food and mealworms. The CGD and baby food will dry out in the first day.
You've honestly got me thinking now hehehe.....i'm really going to have to think about how i can go away once i'm out on my own and if my brother isn't available.
Well hopefully the water bottle thing helps ya out. The bottles are huge and hold alot.
Red 
>>Ok i have never left my leopard geckos for more than 3 days but i have to go away for 8 days and i dont know what to do.If i feed them the day i leave and give them fresh water will they be alrite for 8 days? I have no one to come watch them.
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>>But thats just my 3 cents Email
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Crested Gecko Zeek:1.0, Ziggy and Zeus
LEOS: Boo: 1.0 normal , Bronx & Nala: 1.1 blizzard,
Lily: 0.1 patternless, Abby: 0.1 albino, Zoe: 0.1 reduced pattern, Dot: 0.1 hypo
New Girls: Flame, Karma, Bubbles and Bell pics coming soon
Chip: 1.0 papillion (small dog)