We will be going to Hawaii for 3 weeks this summer and there are about 4 plants that I really care about. For shorter vacations I have inverted a 2 L soda bottle and it emptied into the pots as the soil dried out. This time I am thinking about buying a child sized swimming pool, putting it in the basement in front of a sliding glass door, putting the plants in it and putting water in the bottom, thus watering the plants from the bottom up. Any thoughts? Any better ideas?