Originally Posted by
MRT2
Summarizing your options:
5. See a doctor just to rule out a medical problem like diabetes.
Definitely a good idea, although fat is an insulator and you can expect to sweat more than leaner people. Hot climates like TX exacerbate that.
I sweated 2-3X as much (determined via water intake needed for no net weight change) when I weighed 65 pounds more, and went from 25oz/hour in a temperate climate to 8-12 as I shrunk.
If bike mounted water-bottles won't do it, add a rack and trunk or pannier(s). You can carry a lot on racks (gallons) and be more comfortable than if carried it on your back.