Found this handy tip in my brother's magazine the other day for recycling old bottles to make your own watering can
I didn't have an empty milk carton handy but it seems to work just as well with an empty smoothie bottle.
Just pierce a few holes in the lid
Fill with water and shake viorously over your plants (or hanging baskets that still need to be hung).
Then place with the rest of your gardening gear for safekeeping
Alternatively, you could just fill an empty bottle and pour the water straight on.
But then you'd lose that all important sprinkler effect/satisfaction of making your own gardening equipment.