I live in Montana which complicates water. I dare not leave any in the car in the winter since it can get quite cold here. Generally if I'm leaving town I'll have a fair amount with me. In the spring and summer (outside of the times that freezing is a danger; hard to pinpoint since we got 3 hours of heavy snow today) I usually have at least two x 40oz SS bottles.
_________________________
“I'd rather have questions that cannot be answered than answers that can't be questioned.” —Richard Feynman