Black duct tape works good, do you 2ply it?

I had a question about watering right when the sprout is introduced to light. If using RR plugs and when they jump out, they'll get placed in a bowl like pot that roots can grow through with the tron. Can I just use ph'd water for the first week, or do I need some kind of nute mix? Also, Im thinking hand watering for the 2nd week will be needed. Same question.