What is the point you’re making please, and why?
no one knows which way he went, the authorities are searching everywhere they can. It is hugely likely :
he thought he was on the short path and didn’t realise., so didn’t buy more water.
he said to his family he was heading back as didn’t feel great, and they said will we come with you, and he said no no, the walk will do me good.
he said nothing to his family.
hes not even on the path they are now searching.
the point is it’s a tiny island, no one knows which route he took, why he took it, what happened to him or how prepared he was. It could be nothing to do with water. He could be somewhere entirely different. He could have dropped down of a fatal heart attack and would have had the same outcome where ever he was. No one knows.