verisim, the reason they drink pepsi is because the water tastes "different" accdg to them...

men who work under the sun sweat a lot you are right, and with sweat you take away the body's salt and some "electrolytes" that help to control fluid levels in the body, drinking too much water doesnt help cause you are depleting the body more of salt.

adding 1 tsp of salt in a liter of water helps, if not any sport drinks...but of course who can afford that..