By that point in time John would already be dead. Simply because drinking, moving etc are actions. Actions which don't lead to the desired outcomes anymore because there are no consequences to them.

It's even worse than that. Without medical intervention John will die of dehydration after a few days because the action of drinking water now doesn't lead to the consequence of rehydration, the action of moving his limbs won't lead to the consequence of moving forward in space and so on. John is royally fucked.