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This is for 12hr though.
For a 100mi I could probably get away without drinking at all, depending on temp.I've tried the bladder thing and it doesn't really work for me. Certainly not in the front. One thing that might work is a camelbak undershirt that I could use on my back but such that it kept it from moving. They're only good for 1.5L though I think and that's not enough, especially given last year's dehydration and final 2hr collapse.
Another option would be to ditch the bottle cage and just grab a bottle, neck it and chuck it each time. But then I'd need someone in place to go get the bottles.
Another option also was to try the water bladder that came with the Tri Shiv. I used it once or twice and didn't really get on with it but I can't remember why. Bit of a faff to refill probably.