If its just a pain to get to back ones get a watering can and afix some semi rigid pipe like 1/2" pex making a long spout... doesnt look like urvset up is big enough to build an automated system for, mine is of similiar size.
One thing i do in flower room is i have 2 gallon square jugs affixed to wall in my work area outside the room and some 5/8" flexible line to a watering halo on each, with a stop valve. I mix em up turn valve on, job done. Closest i see to automated i need. The hoses to halos works nice in flower when it gets a bit full in the room.... i dont like wasting light lighting up a bare floor