thanks all! I drink a lot an hour before my ride (stopping 30 minutes before I pedal out) and on the 20 milers I did not finish my single bottle (on top of drinking a decent amount of water in general). But, I also drink a lot after. This ride will have a planned break at the 20 mile mark if needed where I can refill the two bottles. I don't know how much is between mile 1 and mile 20 though so I am packing a little food.

Should be around 80 degrees this weekend, 56% humidity. I am going to try to carry more than what I think I will need.