What do you have on your bike for a 70.3 (nutrition, repair, hydration)

2 spare tubes, 2 CO2s w/inflator, multitool w/tire levers & couple dollar bills (to use as temporary 'boot' in case of larger tear in tire)--either under seat in bag or in bento box behind stem.

1 or 2 bottles on bike depending on distance between aid stations. One horizontal between aero bars and the other on the frame, if necessary.

Gels in flask(s) in jersey pocket.

I ran race wheels with tubulars, so I had:

1 bottle Vittoria fix-a-flat taped to my seat tube - no other bike tools or supplies

1 Gu flask strapped to top tube w/5 Gus inside

1 aero drink bottle of water

2 20oz bottles of Accelerade in frame cages

1 serving of dry Accelerade to mix with hand-up water in jersey pocket

1 baggie with fig newtons and ginger snaps in other jersey pocket

Yes, I was a rolling buffet.  It is interesting that the other responders live almost completely off of the land.  I was nervous about trusting my race-day nutrition to the race folks so I brought everything except the extra water with me. 

This year, I will have:

1 bottle of Vittoria fix-a-flat taped to my seat tube

1 aero-bottle of water (maybe - depends on weather)

2 bottles of Gu2O in frame cages

4 Gus in my bento box

1 envelope Gu2O to mix with hand-up water in jersey pocket

1 contingency package of Chomps in bento box

possibly a couple of ginger snaps for the valley of darkness also in bento