Dennis , You are right , drink lots of water. I already got dehydrated on a trip this year. I had to hole up early one day because of it. I guess age has something to do with it, and meds. I thought I was drinking enough, but apparently not.
I got queezy, headache, shaky muscles not thinking clearly. I stopped at 2 pm and it had been three days of 90+ F. heat. I knew I was getting dehydrated when not going to the bathroom as often as normal. So I drank about a gallon that evening. And about a quart the next morning before riding again. Quit early the next day also. Better by the third day, It was a 500 mile day. Drank a lot at every stop.
So do as Dennis says and drink Plenty of fluids.
MaxB
MaxB