My first year of participating in events and I've already seen a pretty wide range of what might be found at the rest stops or not be found. I try to bring about what I would as if it were unsupported and if they happen to have good stuff at the rest stops I might eat theirs instead, but I don't count on them having everything I might need. Plus, I like to keep some Jelly Bellys, etc. handy if I feel the need whenever that might hit.

I defiantly bring my own extra tube, pump, multitool, etc. - I take my phone, a little money, and ID too.