You've got the hosepipe - you're half way there. Outline your borders and make sure that you dig in hosepipe - well punctured at regular intervals to allow a steady seepage of water into the beds. Connect to water butt when needed. Simples.
Put the pipe to the back or front of the bed so you know where it is. Plant accordingly.
Put the pipe to the back or front of the bed so you know where it is. Plant accordingly.
The only thing necessary for the triumph of evil is for good men to do nothing.