I have worked for years for my family at our store.. it's like a feed store/ garden/ everything else store.. and I get talk to all of the old people in the area and I love it! I do learn so much from them, and am humbled by the way they all grew up providing for themselves in so many different ways. I know so much for a young guy about gardening, I just wish I had time to get into mine a little more and put it to use!
Funny story- I was always a quick sell to any girl's parents when I was dating around because I could talk to mom about her flowers and dad about his pepper plants "what's that, a japanese beetle? you know what you could do is.. well dad those potatoes don't need nitrogen so much as they do phosphate" hahahah, it was terrible but still cracks me up that I used that.
Hey about that watering.. natural water is always best for plants (rain, pond, well). One way to get fresh is to rig up a system where your gutters run into a holding tank like wooden barrel or plastic barrel or trashcan. I don't know about metal barrels because of the rust.. but in an arrid place like yours you may want to put a lid on it to keep the water. Cut a hole and put in a spout of some sort near the bottom of the barrel and you can hook it up to a hose that runs over to your soaker hoses. You can always keep track of how much water you are using by watching the levels.
Some people make their own soaker hoses by taking 1" PVC and drilling holes in it, then burying them along the rows. You can even put a single 4" spout at the end of the garden that runs to all of them so you can run buckets over to one . If you wanted you could buy the parts and put a female connector on the pvc for a water hose if the barrel is too far away. You can also use a dolly to pull the barrel over to the garden and buy one of those 12" connector hoses and run it between your barrel and your pvc, just make sure you put a shut off valve on the barrel's tap.
The cool thing about gardening is the options are endless
oh and I would always water early in the morning in case your barrel gets hot during the day, you don't want to scald. Plus it's always best to water in the morning or evening, NEVER water in the middle of the day especially with direct cold water unless it's an emergency. I personally like the evening, considering I don't have the hot water dilemma, because it gives the plants a chance to soak up the water rather than fight the sun and wind all day for the moisture if you water in the morning.
TreeMD was right about not over watering too. Over watering usually has to do with the frequency of watering. Sometimes you will literally drown a plant. Actually I think it may have to do with being too wet for the microorganisms that really feed your plants' roots. But another this is, most plants need a "drying period". Of course in texas that's probably not much of a problem, it can get pretty wet and humid around here so people are always watering too frequently. People that say they water their plants in the morning and the evening, and if they skip one watering the plants wilt by the next day. Well, that's because the plants haven't grown the proper deep root systems they need because their root systems haven't had to go plundering for water. Farmers worry with a spring /early summer full of rain that makes their corn shoot up like crazy because due to contant moisture, the corn actually isn't growing a proper deep root system to be ready for a dry summer. This concept is the same for your garden.