Drinking Filtered Rainwater

I've been drinking rainwater off my roof all year. I put just 50 square feet of metal roof on my back porch roof, (you may need more) connected it to its own gutter, with gutter guards, fitting an overflow and a first flush diverter, and bring the water into tanks on my porch where I fill up my Lifesaver 5 gallon jerry can which contains two filters in it. The gerry can I bring into the kitchen and fill a jug from there. 

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Pictures from left to right on each line

Outside view of metal roof, gutter, overflow, first flush diverter, and fill pipe stub to go into porch.
Tanks inside porch with fill pipe connected.
First flush diverter parts from purchased system. First flush takes first few gallons off roof and puts it in pipe with ball rising to close it off, while cleaner water flows to wherever you want to put it. 
Gutter view with overflow, first flush drop and fill pipe in place. 
Lifesaver 5 gallon jerry can with pump and two filters. 

Pictures of supplies for drinking rainwater from roof