Nutrition ideas for first tri on Sunday?

Personally, I never do dairy before a race or any training in hot weather. But that's just me - these are the kinds of things you need to test out well in advance, so you have a good game plan on race day.

Something fairly substantial and bland (ie, a bagel or toast with pb, etc) works well for some people - carbs, with a bit of protein, not too much fiber. But again, it really depends on personal taste. Some people can stomach bananas beforehand, some cannot, etc. If the yogurt/pudding combo made you feel like crap, I'd say try something else that you know will work for you.

Generall, it's good to try to eat early - about 2 hours before the event - gives the food time to digest and get into your system, and to settle, so you're not tasting peanut butter on the bike. The night before, I go for some carbs and some protein, maybe some salad. You don't have to overload on the pasta, but a side portion with some chicken or fish is a good idea.

Again - food is definitely a personal issue. What I've listed is what I generally do. Might not be the best plan for all.

thanks everyone who has replied so far!  It is a sprint distance for me on Sunday, and bread is not an option for me.  Chris, I was thinking along the same way with the Clif bars, but wasn't sure if I might need something more substantial or not.  My initial plan was a yogurt, clif bar early, then a GU at the start of the bike, water during, some quick gatorade at T2 transition, then water during the run.  The run is my weakest event, which is the only reason I am considering gatorade beforehand.  I see that getting rid of the yogurt is almost unanimous. 

Nutrition was not your problem (unless you skipped dinner the night before or something).  The heat, humidity and your endurance were your problem.  In other words, you suffered from fatigue.

As others have said, eat something small and easily digestible a few hours before your race next week and you should be fine (from a nutrition perspective anyway).