Put a tiny pinch of soil moist in the middle of the pot that you are using to plant your plants. This product retains water and releases it to the plants later.
Also, I use a potting soil that has soil moist already incorporated. It is called Sta-Green with soil moist.
http://www.sta-green.com/ProductCategor ... PottingMix
Sta-Green with soil moist
These two products make life so much easier.