Fall is more about handups (beer, sausage, dolla dolla bills y'all, etc) than it is about bottle feeds, but you never know you might get wicked bored and want to practice feeds some time. My first direct experience with bottle feeds was at my first 3/4 race, as a freshly minted 4. After the race, at which I'd pretty much gotten my behind kicked until finally my chain decided to have mercy on me and break, this donkey on my then team was berating his girlfriend for screwing up his bottle feeds. Apparently that race was his ticket to a pro contract, and she'd put paid to his dreams. These are things that warp young minds, and my initial attempts at both feeding and being fed were tinged with fear that I'd lose my shot at the bigs and be forced to excoriate my wife. I get yelled at all the time so I wasn't too worried about that end, really.
There are as many feed techniques as there are people to feed and be fed, but only a few of them work. The most effective, in my estimation, is the "Dainty Crab," pictured below and for which we have the lovely and talented Laura Hill to thank. The strength of the dainty crab is that the feeder is able to hold the bottle securely, yet the rider can easily take the bottle with a decisive grasp. The feeder can also easily and securely extend or retract the bottle, or change presentation angle. In a lot of tries with a lot of riders, we have yet to boot a bottle with the Dainty Crab.
The "Grippery Nipple" is another good technique. The advantage is that the rider has the full real estate of the bottle to grab, so a big target. It is also an easy release, as the feeder's grip on the bottle is necessarily light. The feeder is not able to manipulate bottle presentation as with the Dainty Crab, but this is a good technique nonetheless.
"The Paul" is a technique employed by a teammate. I have once received a feed using this technique, with a 100% success rate. This technique offers the feeder the most secure (really, it's unbelievably secure - defensively so, even - "take this bottle, I dare you!") grip on the bottle. The disadvantage is that the rider might be thrown to the ground if the feeder doesn't give a timely release. The advantage is that the rider, having successfully wrested the bottle out of the feeder's iron grasp, will have confirmed his superior strength in the act and can confidently proceed to crush the souls of his competition. As with all things Paul does, this is a full commitment technique.