Watering plants when away and blossom-end rot

I have about 18 potted outdoor plants (in 2 gallon-6 gallon pots) . I will be away for 2 days and want to make sure that my plants don't die. Most of them are vegetable/herb plants.

I have been saving empty bottled water bottles and was thinking of using them to water the plants for the 2 days. I heard you just fill them with water and invert the bottle to water the plants. Any tips of what is the best way to use them.

Also, I have 1 tomato plant that is unusually thirsty. It's a Fourth of July and it wilts by afternoon even after being watered in the morning. All the other plants have the same soil and are fine. This plant's soil is all dry while the others are still wet. I think it has also developed blossom end rot. Any tips on how best to water it would also be appreciated.

Did you see one of today's articles?
http://davesgarden.com/guides/articles/view/2563/

For two days, I would just give everything a really thorough watering the night before you leave (or the morning you leave if you've got enough time). I have containers smaller than that in full sun and even when it's 100+ out I only water them every other day, and if it's cooler than that (80's or low 90's) they could go 3-4 days without watering. The only time I've found I needed to water every day was when I wasn't really watering things thoroughly--when many types of potting mix get too dry, they actually repel water, so when you first water them again, a lot of water will run out through the bottom and you'll think you've watered it, but in reality most of the potting mix is still really dry so in reality you need to keep going on the water until the potting mix is thoroughly soaked. Your summers aren't as hot as mine and your containers are bigger, so unless your plants are really rootbound and there's hardly any soil in the pots to hold water, there's no reason your plants shouldn't be able to go two days between waterings if you make sure they're watered thoroughly (I can usually tell when things are thoroughly watered by lifting up the pot--it's generally pretty easy to tell by the weight whether it's got a lot of water in there or not, or you can always do the "finger test"). And if you do have a couple containers that are on the more rootbound side and really won't hold enough water, just move them to a shady area while you're gone and that will slow down how quickly they're using water.

Thank you. Those are really helpful tips. I think I should be set.

My only worry now is the tomato plant with the moisture problem. Do you think it si blossom end rot? Should I remove those tomatoes or can I just let them ripen on the vine?

Sorry, don't know much about tomatoes--here's a link about blossom end rot that may help you http://vegetablemdonline.ppath.cornell.edu/factsheets/Tomato_BlossRt.htm or else you can probably get some advice on it on the Beginner Vegetables forum. I would check and see if it's really rootbound--the fact that it's always wilting and always dry like that suggests to me that it could be rootbound. When you've got tons of roots and not much soil around them it becomes virtually impossible to keep something watered properly.