I had a fairly dismal time in the allotment last year, owing to the drought. The only water we have is from a shed roof. Normally, I can get by by ferrying some water there with a handtruck if it is not dry for more than two weeks, say.
I think it went on for two months.
Anyhow, I did manage to salvage some plants by using straw as a much (beetroot, lettuces, surprisingly enough, leafbeet, French beans, New Zealand spinach - the potatoes did well because it rained a lot while and a long time after I planted them). The water situation is exacerbated by the fact that two of the gardeners have erected some green plastic warehouses to house tomatoes (the one grows 100 plants, and claims only watering them every three weeks - I have my doubts, still) and as soon as a barrel fills up (there were a couple of days of rain during the drought) they rush out to water their plants.
Anyhow, grumbling aside, I would like to hear any suggestions you might have about what water-resistant plants I might think about using!
Anton