Our site does have taps but I try not to use them. It is possible to collect enough water in barrels in the winter to see you through the summer especially if you get into serious mulching.
Also about half the rent of a plot with water will actually be for the water so choosing a site withour water will teach you good practice and save you money. Every time I see someone use the hose on my sight I see my annual rent rocket.
We have taps and water and its great to hose away. I also use the hose to fill the water butts too when they are low. For me the bit extra you pay for the water is worth the cost.