For reference, here are a few links for the parts I used for my water table fluid system. Kept it simple and used garden hose fittings for most fittings since they are readily available and only need to support low pressure.
Filter strainer at the top of my storage tank
LOVHO Sediment Filter Attachment…
16 gallon storage tank (really holds about 17 gallons which perfectly fills the table)
RomoTech Domed Polyethylene…
Brass drain with ball valve (2 of them, one each side of water pan, it is larger diameter than stock so you need to punch a larger hole in the pan)
RAINPAL RBS024 V2 Brass Rain…
Y garden hose adapter
Morvat Heavy Duty Brass Garden…
Plastic valve on bottom of tank feeds into inlet of Ryobi water pump and a second valve for top of tank connecting to filter strainer ( had to drill hole in top of tank to mount)
Rain Barrel Spigot Kit - 3/4" PVC…
Garden hose barb kits(for all vinyl hose purchased from Home Depot)
Twinkle Star Garden Hose Repair…(2 kits)
Worked great so far 
Let me know if there are any questions.