I'm in exactly the same situation, for the same event.
I'm also a particularly sweaty bastard so need plenty to drink.
Bought a cheap 2l 'BTR' branded hydration bladder (£7, incl. a cleaning kit, after discount code and arrived free the next day) and sewed a little adjustable webbing neck strap to it to facilitate putting it on/keeping it from sliding down my front. Trimmed the hose down a bit and works very well, no neck irritation (under skinsuit with a Wiggle sleeveless mesh base layer), but just ordered a 90deg valve from eBay because the straight one requires a longer hose. Was going to test it out properly at the WVCC 25, with about 700ml inside, before it was cancelled.
Also got a Shimano Pro 'Aerofuel' rear saddle bottle mount thing, which is just going to have tools, Pit Stop and a rear light attached to it.
I got a B-twin one from decathlon, they have a 45deg nozzle included and are really cheap. They seal with a bar across the top, but it's not really been an issue for me.
I'm in exactly the same situation, for the same event.
I'm also a particularly sweaty bastard so need plenty to drink.
Bought a cheap 2l 'BTR' branded hydration bladder (£7, incl. a cleaning kit, after discount code and arrived free the next day) and sewed a little adjustable webbing neck strap to it to facilitate putting it on/keeping it from sliding down my front. Trimmed the hose down a bit and works very well, no neck irritation (under skinsuit with a Wiggle sleeveless mesh base layer), but just ordered a 90deg valve from eBay because the straight one requires a longer hose. Was going to test it out properly at the WVCC 25, with about 700ml inside, before it was cancelled.
Also got a Shimano Pro 'Aerofuel' rear saddle bottle mount thing, which is just going to have tools, Pit Stop and a rear light attached to it.