NUUN: http://www.nuun.com/

ELETE: http://www.eletewater.com/

I couldn't handle the taste of NUUN. Although the "sugar" is sorbitol--the substance in the gums your dentist wants you to chew.

Somewhere else on the board someone talked about Elete. It has no flavoring--it takes awful when you're not exercising, but once you start working out, you don't notice the saltiness.