+1 to what Philip said. Long arms and even a little flexibility help. Tall slim bottles promising extra intelligence, too. Other HMG owners have said no way can they reach the side cupholders.
Another option is shoulder-strap water bottle carriers offered in variety of shapes, sizes, and weights. Not for me. Can’t stand swinging a lot more weight around to put on a shoulder strap.
I’ve also decided that drinking water at rest stops kills two avian fauna with one cobble – when I need to rest, I take a drink, and vice versa. Water bottles in the big back/front pocket would work OK, but I like cupholders better.
— Rex