Even the sugar free versions offered by wallly-world aren't bad.  I picked up some lemonade packets the other day when I couldn't find the Crystal Lite brand (which I typically prefer).

Crystal Lite "Classic Orange" makes an acceptable breakfast drink...mixed as PJ suggests...2 per nalgene.  If you want to make a "personal sized" drink, I find the 16 oz. disposable water bottles to be the perfect size.  And, you can cut the bottle in half and use the top portion as a funnel in a pinch.  (I often bring a pre-cut section for capturing cooking oil on my trips.  Its light weight and disposable, but bring a plastic bag for storage after use if you plan on re-using it  Save the cap to avoid drips.)

However, I still prefer the "Cold Brew" Lipton tea bags for my evening "iced" tea with dinner.  Two bags per nalgene with an adequate wait period typically produces an acceptable drink.

dd