What works for me is taking a big gulp (in my case nuun or G2 diluted) every 10 minutes max. I don't think you did that. It will help when you can drink while riding, but in the meantime, plan to stop every 15 minutes and drink. Eat every 30 minutes.

On a 4.5 hour ride, it's imperative that I eat--more than just shot blocks. I eat a PowerBar over an hour, so that would mean that I would have eaten 4 PowerBars. Now, I really would not eat 4 PowerBars because it would make me gag--I would have eaten two over the course of the ride, and stopped at a store and had some beef jerky, more gatorade-type stuff, and perhaps some almonds. At the end, I would have enjoyed chocolate milk and potato chips.