What size Reservoir & Pump do I need for my Flood Tray?

So you're building your own hydroponics flood and drain system from parts and pieces but don't know what pump and reservoir are the right size for your flood tray?  It might take a little math, but the calculations are well worth the effort.

Why is it important to grow my own food?

With the all the modern conveniences of today, you might ask, "why should I grow my own food?"