No probs at all.
I’ve varied from maurten and sis beta. Can take either equally as well although I find maurten slightly harder to work with as it clumps / thickens a bit more easily I find.
For training I tend to just go with sugar, water and dump some electrolytes in there for flavour and the obvious other benefits.
Come race day, I have a large front bottle (giant trinity) that I fill up from an aero bottle on the frame and also from slightly over concentrated bottles on the rear. So I have about 3.5 litres on the bike and I can add water as needed. Few gels for caffeine on the bike (love the maurten gel texture) and that’s about it.
For ‘breakfast’ I will have a strong coffee to help get things moving and start the caffeine train. But otherwise I’ll have a small energy bar or a small white plain bagel. I’ll take an energy drink into transition and drink that plus a gel before the swim.
I’ve come to the conclusion that IM is basically 24 hours of very little food for me, with last meal mid afternoon the previous day.
Then cross the finish line and eat everything that is in sight.
But everyone is different. I know pro IM winners who have a couple of snickers on the bike and could stomach dozens of gels in a race. Ability to absorb carbs is a big differentiator for performance. Pro’s are basically all great at eating.