I must say I like the notion of the water wand...have seen them at stores. When i let the hose trickle I do poke it into the ground at several points around the base of the plant so it doesn't run off.
@bubba man where do you live? It would be helpful to know. Clearly somewhere southern and hot I guess. You can just get some gallon or 2 or 5 gallon buckets to guage how much your system is delivering per minute or whatever. Although I confess I've never done this, I'm a painting contractor so I have a pretty good idea how much time it takes to fill various sizes of paint buckets.
Pretty much impossible to over-mulch! I use a combination of wood chips (a bit pricier) and straw, which is inexpensive here; about $4.00 per bale. Helps a lot with weed control too. And helps prevent soft or buggy parts of things that often rest on the ground such as squash and cucumbers.