This was my procedure for yesterday's Ironman Fl race. BTW, I'm 63
Awake at 0200, ate a banana with fresh ground peanut butter, NOTHING but ground peanuts, some OJ and water with 2 acetaminophen-0630 one e-gel and a sip of water.
Race started at 0700 2.4 mile swim
Transition 1-one bite of squished banana, dark chocolate chips, raisins, dates, water
Started 112 TT with 1-aero bottle with water, 1-24oz bottle with e-fuel, 1-24oz bottle with 2 gel packs of e-gel
at 53 mile turn around stopped for 1/2 bagel with peanut butter/strawberry preserves, 2 mouthfuls of raisins-dates-almonds-dark chocolate chip mix, 1 e-gel packet, mixed a Mtn. Dew with left over e-gel water bottle, mix new e-fuel bottle and refill aero water bottle, consumed 1 additional e-gel packet at mile 90
Transition 2-water
for 26.2 mile marathon consumed sips of coke, chicken broth, Perform and ice water while taking on little bites of oranges, pretzels, bananas, chocolate-chip cookies, grapes and a couple packets of Gu
So full after 13:31:48 of racing the only thing I had after finish was chocolate milk and some Tomato soup
Moral of my story is be prepared because you can always NOT eat and drink when you have it available but if you don't have it with you, you are stuck without.