i live in a real harsh environment so we expect a high casualty rate, so plant them all and tie them down. Now drought, you can use self watering pots, get a paint bucket, bunch a hole in the bottom about the size of a small cup pass through about a 1 foot strip of pure cotton sheeting, place this bucket inside another wich is a quarter full of water and nutrients, this is called the wick system and the plant gets water from the cotton through cappilary action- very effective but the pots can be a little bulky.
Alternative get water crystals and stirr through the soil, good but if you get to much rain the fuckers can cause root rot.
I have always prefered the wick system, like a hydro out doors, can put fertilliser in water but its better in the soil as it can do funny things like turn high ph or develop new never before seen life forms. Hope that helped