Originally Posted by
hokie cycler
Don't over think it. Carry the same tools, tubes CO2 etc. as you would normally and bring food but don't think you need to bring all your food for a century. There will most likely be enough of a variety of food at rest stops that there will be something you will like. Don't spend too much time at rest stops but remember it's not a race so don't push it too hard. Enjoy the day.
I do more unorganized distance rides than organized, and I still don't bring all the food I might need, count on stopping off at gas stations, espresso stands, whatever... so yeah a $20 in addition to usual repair/spares.