Re: Lost in the desert: could you survive indefinitely on beer or cofee alone?

No I don't think you can survive on Beer or Coffee alone. This because, 
like you said, caffeine can cause dehydration and alcohol too (this one of 
the reasons that people who get drunk get a headache) Your body has a 
hormone called vasopressin which keeps the water in your body ...alcohol 
inhibits this hormone ...and so will cause you to dehydrate. I don't think 
you can survive by drinking your urine (you're right when you say that your 
urine looks really clear when you have drunk some beers or coffee) but 
don't forget that the biggest factor of losing water in the dessert is 
sweating ... and by this you will lose so much water ...that some times you 
don't have to pee any more .... (so no urine) 
I'm just a simple scientist who doesn't believe that drinking urine is that 
good for you .... But there is a group of people (a pretty big group 
...almost 2 million members) who think that drinking urine is very good for 
you (????). And I think you can find info about them on the Internet.

I hope you have got the answer you needed ...
Till next time 

Greetings 
Dave