Hi. There are many options. The basic is for example berry bushes, or fields with crops. Unharvested crops stays at fields all time long. So you can only take what you need and replant that. Then you can make a cellar and advanced food like cheese or cured meats whitch stays fresh for years. And when you advanced to the level when you have cellar ice, the cured meet and the cheese stays fresh double time sincein the cellar of course. So the food is not problem even you don't play in month at SMP servers.