In short, I don't know short of testing. I like a single or double hand bottle and a hydration vest with storage space.
The long answer is as follows.
I need to do some testing on my longer runs to see what works. The responses came up with a variety of options (don't be overwhelmed):
1. 1 or 2 Bottle lumbar pack
2. 1 or 2 bottle lumbar pack with a hand bottle
3. Single/Double hand bottle
4. Single/double hand bottle with a lumbar pack
5. Hydration vest /w hand bottle
6. Hydration vest /w hydration hose
7. hydration vest /w hydration hose and single/double hand bottle
As I stated, there will be aid at mile posts 7.6, 13.3, 17.7 and 27.4; finish is 31.6. I didn't keep track of my fluids consumption during the marathon, but I will be keeping track of fluids consumption during training runs that are over 10 miles.
I have 10 weeks until my first ultra. That gives me plenty of runs over 10 miles where hydration and sustenance could increase training quality. I just re-wrote and adjusted my training plan last night to configure my speed workouts, and mileage per week.
Back to your original question: I have used a hydration bladder a few times on longer runs and found it difficult to suck water through the hose and maintain proper air intake/outflow. I am also convinced (in theory) that using a hand bottle increases hydration – I am still worried by the rotational inertia the bottle's weight puts on a runner's arms, the related fatigue, and the physics-related problems with liquid sloshing around in a bottle. I'll probably end up carrying at least one bottle.
How I deal with the rest of my gear is questionable and may depend on weather. My basic running gear to handle all conditions involves the following:
SS or LS wicking shirt
Windshirt
fleece beanie
fleece gloves
sunglasses
wicking baseball cap
shoes and wool socks
shortie gaiters
marathon-style shorts
spandex shorts (if not used, use bodyglide)
wicking bottoms (only when temps or windchill dip below about 10F)
Knowing the temps on the SHT, it could be 35 at race start and 90 by race end – especially on the 50 or 100 mile race. Conditions will dictate what I need to carry. I like the idea of having. Short of testing both a vest and a lumbar pack, I'm not sure how to determine. I threw out GoLite's name our of trust of their brand and my lack of knowledge of any other companies who make the stuff – hence my original post stating that I know nothing.
My other option is to carry a minimal amount of gear on me and leave everything with my crew – the issue is that if I need something two miles into an 8 mile stretch between aid stations, those final 6 miles will be rough. This would mean I carry one or two hand bottles with some Gu or something in the pockets – and nothing else.
edit: @ Ali – my girlfriend just started running – 2-3 miles at a time, slowly. I'm curious where she'll get to and I hope she sticks with it. A buddy of mine likes to say that he'll never stop running because it sucks so much to start up again.