First of all, I hate pritchard nipples because it seems like they inevitably leak. If not around the threads, through the little flutter/ball valve thingy. I use the grey ones like you can get at caprine supply.
Second...anything bottled by Coke (around here anyway) is a non-starter for bottle feeding because they switched to the half-height cap. I'm guessing it was some type of cost savings measure since the thicker plastic is in the threads and cap of most bottles, but they just won't work..
Pepsi and Mt. Dew bottles still work, but some of the water (Aquafina, for instance) bottles seem to be getting thinner and thinner. I figure the Pepsi and Dew bottles will be thinner soon, too.
We usually use 20oz Ale-8-One bottles.. They're a local bottler and their bottles are still pretty hefty with a full-height cap.
To get a baby started on a bottle, we use 12oz Ale-8 longneck glass bottles. Preheating the bottle in hot water holds the milk temperature longer, allowing you more "fighting time" with a baby before the milk runs cold.