This tub:
https://www.lowes.com/pd/Creative-Pl...Pan/1000608719

I used this as a guide:
http://www.arbreptiles.com/cages/rat_rack.html
I used 2x4's an ripped them with my table saw. I'm short an wanted room so the are 5 rackers (plus the kids are really short). I only use .25" as hoppers will get out of .50"

You could go 1/5 or higher but would need bigger tubs. Have more in the cage to cause more problems. An when 5 or more drop litters at the same time, no thank you. If you don't handle them as pinks an cull demons your hand will be a bloody stump! Start with one tub an see how it goes. My kids say that ASF are cute but rats are nicer. Unless your feeding ASF pinks I would start at 1/3.

For water I use rabbit bottles, I can see if something is wrong easier then the bucket system (an I built three of the ).

Good luck!

PS: Another market for ASF: fish bait, an natural cat food.