It also depends when you're going and what the weather will be like (at your home not on your holiday...)
I wouldn't suggest you provide the details but if its soon the plants will be small and not needing much water per day. A good soak should see them through. If its at the back end of the growing season you can chop off the leaves to save on water uptake. The plant doesn't really need the leaves and all they do is allow the plant's water to evapourate. Your fruit will still continue to swell and ripen without them. The difficult time is at peak growing when you have big plants 4' high full of leaves but only just flowering and making tomatoes. If its really hot and sunny the water needed will be more than cold and damp.