Figuring out RV rain water collection

Hose on rain spout down to bucket.

Below I hook this on the dump valve then to the roof hose.

The Sawyer tap filter makes the water safe to drink.

 Trial RV rain water collection is an interesting subject for me.  I have taken bits and pieces from different YouTube videos and added my own.

First design is to simply attach a hose to one or more of my 6 roof rain spouts, down to a 5 gallon bucket with an overflow port. Five gallons of water is enough for one person for 2.5 days.  Two five gallon bucket’s will last five days or 2 people for 2.5 days.

Second design is hooking up the two back rain spouts by hose or pipe down and under the back of the RV to our freshwater dump valve. When it rains we open the dump valve and the rain water from the roof will fill our fresh water RV tank through the open dump valve.  Once full the excess will go out our overflow pipes to the ground or to empty into extra buckets.  Closing the dump valve will stop the water inflow.  I will add screens over all openings and see if I can put in a 20 micron filter in the hose to the dump valve.  For drinking I have a Sawyer Tap Filter and or if needed we can boil water for this purpose.  

We also have two six gallon jugs we keep water in in the bed of our truck.  Below you see the hose connection for our freshwater tank through the dump valve.