I did have that "sprinkler system" on a timer - I found one that could be set to run for a few minutes at a set time of day. For a few days, extra light is not important... I had my setup all winter, so that was all the light that the plants got. They survived, but were a lot happier when I could accommodate them in a greenhouse. With only two big plants, it could work for you... you could move them out during your own shower, then put them back. Although sharing the space is intriguing...