Grey water is an essential fact of life where we live. As is all water collection and mulching. Planting too close together is not productive and only leads to underdeveloped wilting veg. Space them out and mulch as well as under a shade cloth is the only way things grown and develop, else there are not enough nutrients in the soil. Here, the humidity drops below 20% in summer. All veg here is grown under shade cloth for plenty of reasons, too numerous to cover all of the reasons, but an exceptionally high UV index (15), months at a time without rain and no mains water or sewage are just a few of them. The trick is to adapt and not to expect it to work as though it were a farmer's field where you can grow a single crop in bulk and water freely.
I also have to garden by hand. A tiller is not an option, nor is not fencing everything in to protect it from anything and everything else which wants to eat it. (My back can not manage a tiller - I am partially paralysed and whilst I can walk and hike again and am out of the wheelchair now, I do not expect to stay that way, and I know I have a spinal deformity.)
Using shade cloth means I rarely have to water. In fact, I only water when the plants start to wilt. We have no backup for drinking water, so it is a balancing act between watering the veg plot and us having drinking water. When that water tank is empty, it is empty, no sanitation, no drinking water and certainly no daily showers (ever - water is too precious). You learn very quickly that hygiene can be maintained with a bowl of water - no need to shower daily (your choice is shower daily or have drinking water). Plus, we shower standing in a tub - that way we know exactly how much water we have used and that water can be collected and used on non-eating plants in the garden, or on edibles when they are not producing fruit or veg we eat. Herbs are the only exception; they get clean water, or die.
Just my thoughts on living in a land where it can be months between rain showers, no mains water and very hot, dry weather for long periods of time. Our temparture ranges is -15C to +45C depending on the season. Summer is our 'dead' season here. It is brown everywhere. Autumn is the start of the planting season, winter is a slow growth season and spring is when you harvest.