Since it looks like this summer is going to be long and hot we have put in some shade covers for the vegetables. We are on tank water and the aim of the covers is to reduce the evaporation rate on hot days. We have used this method in the past for the rhubarb, which has such big leaves it takes a hammering in the hot weather. Attach the shade cloth to wires with the special clips and run the wires between some stakes.
Some old fence palings are useful to provide some temporary shade and reduce transplant shot for seedlings. I just prop them on a couple of seedling punnets.
Another way to make sure the water ends up in the right place is to add a section of pipe beside some plants such as the pumpkins and zucchini. This means the water gets down to their roots.
I found another use for borage on the weekend. I was looking for a method to pollinate the zucchini flowers to ensure the fruit develops, so used a bud from a borage, which is hairy similar to a paintbrush. Flowers from this plant are edible sometimes added when making ice cubes for a bit of interest in summer drinks.