5 gals are probably be too big, coco likes smaller pots versus soil. 2.5 to 3 gal is probably the biggest you'll need. Mixing with perlite (30%) may be a good idea. Watering will depend on many things, something you'll have to find out. Might need to hand water at first until you get the hang of it.

You can use nutrients that are coco specific, like Canna makes their own coco and nutrient line for it. You can also use hydroponic nutrients like GH flora (look up "h3ad goes coco" and "the recipe" from Rezdog, lots of good info in those).

This is just what I've picked up from reading, no practical experience yet but I'm preparing like yourself.

Maybe someone with coco and drippers can chime in, but haven't seen many of them around here.

Why the need for drippers? Can you not visit the grow site everyday?