You got to remember even if you put 2 water dishes with the pacman frog that when he is an adult when he poops and pees these are not small. So even putting more then one dish if he pees in them lets say and doesn't poop he is still going to absorb that in when he sits in the water. And sitting for a week or two in that kinda heat and humidity you are bound to grow some kind of bacteria in the water and he is going to absorb it and more then likely become sick. If you could get a friend or family member to check on your frogs that would be your best bet I think going away for that long. And im not saying he will absolutely become sick but sitting in that kind of water you would probably have a high risk.