D.B.
They are garbage. You can get a flavored hydrator isotonic sports drink on line (betacarotene, no aspartame or sucralose, none of that chemical stuff) if you want. It doesn't come in packets though - but you can put it in something to take with you - I use a small container to keep it with me. I can give you the info on that if you're interested.
Bottled water is a huge rip-off - much of the time it's from an unregulated source (vs tap water which has regional taste differences but lots of testing and regulation). A lot of bottled water is just municipal water from another part of the country, put into bottles made with fossil fuels and then transported by truck (using more fossil fuels) through HEAT which then breaks down the plastic bottle and allows dangerous stuff to leach into the water. Then the bottles go to the landfill.
Flavored water is a huge marketing gimmick - most of the vitamin waters are just that - sugar, dye, chemical sweeteners and junk we've been convinced is better for us than plain water. It's a way to make more money as people shift from soda to bottled water for "health" reasons. It's contributing to obesity, sweet-cravings and unnecessary expense.