I will start since I just did PR. On the bike, I used Honey Stinger gels every 40 minutes, starting with non-caffeine for the first 2 and caffeinated for the last 2. Since it was hot and the run was going to be brutally hot, I also took a SaltStick tablet in between the gels (ie 20 minutes after a gel). For fluids I used Osmo and carried a bottle of water to wash down the gels/tablets. Personally, I can’t chew when I am racing so that rules out a lot of options for me.