I intend to run a 19mm pipe down the length of the container on the outside that will deliver the cold water to anywhere I want a cold feed. I started with a short run and dropped a line down to the proposed kitchen tap. I will use 3/4 inch pipe instead of 1/2 inch as this will increase the volume for a gravity feed system. I ran a pipe down the outside of the container and put a tap on the inside and the outside. The plan is to have a gravity feed with a large head to create water pressure. Failing that I can use a pump if required to pressurise the cold system.