I wouldn't think twice about it, at least with the womas. I don't have any experience with GTP's but I'd suspect that an extra large water dish is fine for all of them.
Hold off feeding for a couple weeks prior to your trip so they don't poop up the cage. All you really need is someone to change the water.
I take at least 2 weeks every year, sometimes a month. The only thing I ever arrange is water changes.
Doug T
>>I have some adult Green Tree Pythons and three Womas. I am going on vacation for two weeks and I have no one to take care of them. I am worried that that is too long without care for these wonderful animals. Anyone have any comments or ideas of what I can do? Suggestions? Thanks all.