> people _want_ water if they _want_ to live
> want vs need is almost entirely subjective
People need water if they want to live. Somehow you managed to picked the one need which is literally the single biggest need for life as we know it to exist, making it quite the opposite of "entirely subjective".
A statement like "I think pretty paint on lips is just as important as water because everything is subjective" is not making the point you think it is.