Rode my first century 2 days ago. Left at 12, packed 2 PB sandwiches and filled my camelback with water, Planned to stop 50 miles in, got 40 miles out and ran out of water. Sun was brutal so I was looking for ANYTHING to get water from. In the grand scheme of 100 miles, 10 miles seems like nothing but when you are out of water every rotation is like hell. Finally got to a gas station and my shirt was covered in salt. Sipped 2 huge lime powerades for about 30 minutes and ate some salted peanuts.
That was about 52 miles out so more than halfway done, I figured no big. Rode through the next town and stopped about 25 miles away to get more water, to avoid the same situation, and to give my legs a break. 3/4 of the way there and I was feeling pretty good. Got back on my Trek and started to pedal.
90 miles in and my legs stop. They can't go anymore. My quads are freezing and I don't know why. I stop, hop off the bike and start to pound water and walk it out. My legs eventually start to loosen up so I hop back on. Immediately after I get stung by something on my neck. Hurts like hell now and at the time it was killer but there was no way I was calling someone to come get me 10 miles away from 100.
Tracked it all on strava, took longer than I would have liked but I finished and really that's all I was going for.
EDIT - I had extra weight, I'm staying at a friends so I had a 15 pound bag on my rear rack. Oh yeah the climbing was a *****