I like to use disposable aluminum baking/roasting pans. You can get them cheap and they fit easily under sinks to collect drips until you decide its worth dealing with. For particularly low volumes of water, like an infrequently used bathroom sink, just sprinkle some baking soda in the pan to keep it from getting smelly. I prefer to wait until the problem becomes unbearable or I have to sell the house to deal with it.