Next time, just cut it. So long as you don't need to dump water over your head beyond that point, split the lemonade between two bottles so it's half strength. I take my Gatorade 50/50 for the same reason you mention-- full strength is just too strong, especially 40+ miles into a ride.
I wouldn't do lemonade myself, but that's just personal preference. I have had great luck with Horizon Organics Vanilla Milk, available at a Starbucks near you. Goes down easy, portion size is right, doesn't leave the "mouth residue" behind. Fruit Punch Gatorade might be the king of mouth residue. I can taste it 2 hours after the ride is over.
If you don't flavored water or calories at all, most any convenience store will have Smart Water or Propel Water. Either work just fine for keeping the salts in ya, but the Smart Water is certainly more palatable. Propel Water tastes like someone lightly filtered seawater. It does what it advertises, though.
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