Sure, I have had success concentrating Hammer Perpetuem. They actually recommend concentrating it as one of the ways to use it.

I wouldn't qualify it as "light" though and doubt you would want to dilute it after concentrating it. TBH though I doubt any of these super calorie maltodextrin drinks could be light. If you are concerned about the whole osmality thing I have no clue about that and perpetuem. I do know that some drinks make some claims about their osmality and how it's so great for absorption.

I can put 3 servings (810 cals total) into one bottle. Then sip it over 3 hours with water as needed BTA from aid stations.

Mixing the stuff requires a wire shaker ball canister, if not it is almost impossible.

Main gripe is that is does go sour after too long in the heat. There are ways around it though but it's an inconvenience nonetheless. Hammer does provide all the support you need though on using perpetuem, they are really good in that area.

It has never given me any GI issues but I have never really ridden hard using it. I guess anything will make you sick though if you ride hard enough and eat enough of it. Price seems to be good compared to other maltodextrins out there, hate to say it but I am a cheapie. I wanted to switch to gatorade endurance but it is a lot more expensive per calorie.

I have had good success doing this with tailwind.

Someone should come out with a product specifically designed for this... Enough people make a "sludge" mix out of other products ignoring the mixing recommendations that there is a market for it in long course triathlon. Maybe it is not feasible, but if someone could make a product that gets 2000 calories of ~70% glucose and ~30% fructose into a 20oz bottle I would be all over that.

I've tried Maurten, and it's quite good. I don't think you have to be exact exact with the water content. I tested it with a higher and lower concentration.

My training and race nutrition is First Endurance. For a half, I will have two bottles of 3-4 scoops EFS Pro, and one bottle of EFS Liquid Shot diluted with water. 1 Liquid Shot is 400cal and 100g carb, but easy on the stomach (and easier to get down when diluted). On the run, I will have 1/4 Liquid Shot hand bottle filled with water and otherwise grab water + RedBull and Coke towards the end. My stomach is sensitive too, and FE has worked really well for me.

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CarboPro.

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I use concentrated nutrition as well... Powerbars and EFS gel. Works great.

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SIS isotonic gels in a bike drink bottle. You can get 11 into a 750ml bottle if memory serves me right, all you need for an IM bike along with water and the odd on course drink.

Straight Gatorade.

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Pink? Maybe. Maybe not. You decide.

You risk dropping ALL your cals. You have to mix stuff while riding. You might not mix right.

More people screw it up than get it right. Only takes a few sips of super-concentrated stuff to really mess you up.

Do it in training before he race with it. And keep in mind the stuff they give you at IM aid stations is not that bad, and you can easily carry most your calories in the first place without doing it, so you don’t need to pick up that much.

I've used triple concentration Infinit. Matched it with bottles of water (use transparent bottles so you can see how much you've drunk).

I did lose a bottle of water in an IM so for about a half hour I was without both hydration and nutrition because I was too afraid to drink the highly concentrated Infinit without water.