For roughly 10 standard size birds two 7 lb feeders and a 2-3 gal waterer will last just fine for 5-7 days in normal conditions. I know my waterer lasts a week since we dump & refill it weekly.
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I keep 3 feeders and waterers out so the birds that are lowest in the pecking order can eat and drink too.I would not have a single feeder or waterer, especially if you are not going to have anyone check on the animals. There is a first time for everything, and I would hate to have a single waterer and have it tip over, fall from suspension, be fouled, have an electric line fall into it -- whatever -- and have my birds die of dehydration. They can go without food for a little bit, but they can not go without water. Even if you do not trust people, they are your back up if "stock and leave" or "stock, automate, and leave" ends up failing you. Just my opinion.