DIY Flavored Water?

I don't reckon I'll ever be convinced by the flavored water craze, but I know many for whom it can be the only way to get their necessary 64oz a day.

The release of Pur's Flavor Options - additive packets for your faucet mounted PUR water filtration system- gets one thinking.

Couldn't one make and bottle their own flavored water using safe, natural, and CHEAP ingredients?

Couldn't a little lemon oil or orange extract transform filtered water in the same way?

How about steeping fresh mint or berries in water, then straining the results?

Ideas?