Re: if you freeze gatorade, can the concentrated electrolytes be harmful.

Hi Brian
let me introduce you to the first law of toxicology:
the dose makes the poison.

What this says is that everything is potentially poisonous, or "harmful". 
The thing which discriminates between an actual deleterious effect, and 
no effect whatsoever, is the dose of whatever it is. This holds true for 
everything.

I am not sure what gatorade is, but I am guessing a typical soft drink. I 
don't understand if there is something special about freezing it, that 
would give "concentrated electrolytes". 

Nonetheless, it is all about dose. Assuming you can get "concentrated 
electrolytes"- or a salt solution- it will be poisonous in excess. I 
doubt whether you can take a solution of gatorade and make something 
which is a serious risk under most circumstances. However, there will be 
some circumstances where it is a serious risk; for example, putting a 
concentrated salt solution into the brain, or directly into the blood; 
taking a large amount of very concentrated solution orally.

If the main problem is just the concentration of electrolytes (read 
salt), then you will know about it if you drink it. It will taste foul, 
and you will gag. 

hope this helps
david