Thinking ahead here... It is entirely possible, given the strange weather conditions we have had recently, that we will have a hot dry Summer. In the hope that we will, I have installed an irrigation system for my Marrow plant, which I know will be thirsty even at the best of times. The plant is growing in a big bottomless tub filled with home-made compost:
I have inserted a couple of 30cm lengths of 25mm-diameter plastic pipe, so that I can deliver water directly to the roots of the plant. To put this into place I used the handle of a rake to make a hole and then put the pipe in afterwards, thus ensuring that the pipe is unobstructed.
So it's simply a matter of pouring water down the pipes (always assuming I can locate them once the Marrow leaves reach their full size...)