I have several plants hanging in my balcony from something like this, so when I water them, the residual water naturally spills to the floor. So I was thinking of building a wood planter, similar to the image below, to pick up any residual water.
I'll be building this planter with treated wood. So two questions:
1) Should I drill some holes at the bottom of the planter so that the plants in there don't rot from too much residual water?
2) If I do drill some holes, what can I do to avoid so that the residual water from the planter doesn't spill to the floor?
3) I've read that there are materials I can put at the bottom of the planter to absorb any water. Would this be healthy?
4) Is there any special paint or treatment that I should use with this wood so that it doesn't rot from the combination of moisture, soil, water, humid & hot weather, etc?
5) Any other creative ideas on how to pick up any residual water from the plants above? I particularly thought about this because I can use it to add more plants.
Any help is appreciated.