Thanks, all. Yes, excederin is my post-ride friend!

I am mixing an electrolyte replacement drink with my water already: http://www.gusports.com/html/gu2o.htm

I think the suggestion about drinking more pre-ride is a good one. I'm horrible about hydration, except during and after rides.

I'm interested to see how I do on my upcoming bike trip in Italy, when I'm hopefully going to be having at least one glass of wine with lunch in the middle of my ride