Gary, as Chris Johnson so clearly points out, there are many ways to die on Niku. Dehydration is only one of them. We know that obtaining fresh water on Niku has always been difficult without a lot of work. Were AE and FN up to the task? We don't know. But arguing the amount of water required and suggesting they could have survived until Maude arrived is speculation only. For all we know they died from infection, disease, injury, food poisoning, heat stroke, etc. too many variables to put it down to dehydration alone.