I tried to summarize and tabulate from the comments (although some people had trouble committing):
But here's the final tally (as best as I could sort it):
The handsdown winner: Various configurations of multi-bottle fuel belts--7 votes
Runner up: single-bottle holder--4 votes
Handheld--3 votes (I am secretly jealous of people who can run with handhelds because I think they are bad-ass.)
Camelbak--2 votes
Small camelbak--1 vote
Leave cooler by the side of the road--1 vote
There were some equivocal comments left on Facebook, too. One kind soul (thanks Lynn!) even offered to let me borrow her multi-bottle one, although the thought of wearing it makes me cringe.
Finally, a few of you referred me to the excellent Running and Rambling hydration 101 series.
This is obviously a field of study that needs more ... studying. Someone should offer a Ph.D. in fuel bottles/hydration systems/water carriers (first item of business: decide what to call these things.)
The bottom line is: I will have to move out of my comfort zone, and try something new!
Which one will she choose??



