I have two buildings that require water in my base, a Supercomputer and an Algae Terrarium. I also have an access to water for my duplicates but for some reason they do not try to get water from it. Both the buildings have been sitting there for about 2 cycles without any duplicate watering them. I have even tried changing the priorities but without effect.
http://imgur.com/a/1rlZg (The screens were too large so I had to upload them on Imgur)