Is there a way to make sourdough bread without the long term commitment of feeding a starter? My kids and I love sourdough bread, but I also work 2 jobs, so making bread is, sadly, a once in a blue moon type of thing.  Taking good care of starter would get lost in the shuffle, and I don't want to waste/ruin/starve any starter.  Essentially, I want to make sourdough bread once. 
There are prepackaged portions of sour dough starter available in most grocery stores. They have a shelf life of a few months and don't need to be fed if not opened. This is just one of a couple variants that are available in my next grocery store.  As with every sour dough starter you can just feed it to grow the colony, then use half of it and keep the other half for later. It will last for at least a week without feeding when stored in the fridge, multiple weeks are also possible but it will probably need some time to recover. 