Water spuds? Rarely, but it depends on your soil (sandy/clay/rich loam), and where you are.If the weather is bone-dry for 3 weeks or so, and you have plenty of water to hand, by all means do.I'm in Norfolk: dry part of the Country, but the last time I remember watering was 1959, and even the they didn't get much. That Summer was so dry that end of June I had to deepen the well for drinking water!
In general I'm not in favour of watering at all (except to 'settle' a plant when planting-out, or it's vital to save a crop). If you DONT water, a plant will go down looking for moisture and generally look after itself.That's nature!. If you DO water, the roots will tend to be shallow - OK until the long, hot weekend when you go away, and find on Monday that everything looks very poorly.
Again, GOOD LUCK! -- and keep an eye on what the 'old boys' are doing. Nothing's better than getting info. from your allotment neighbours - they may not tell you EVERYTHING!!,but their experience is often priceless .