The "long rides" I used to go on were 25-30 miles; I didn't feel thirsty, but I was young and tougher then.
Now I have to have a drink after a mile or two.
I will always preach about wearing a helmet. After a few close calls, and hearing stories from my sister-in-law (most of which do not turn out well) I think it is a good idea, which is why I suggested it to a new rider. You might feel otherwise, and that's fine.