A wildlife rain water collection system need not be a major project. Below are pictures of a “wildlife guzzler” I build in remote areas that are short of well water or ponds. FYI, a one inch rain on a 10 ft. by 12 ft. roof will yield 75 gallons of water!
Start with 6 “T” posts in a 10’X10′ square.
Use U-bolts to connect the sides.
Lay rafters and stringers on that, working towards a 10’X12′ roof.
Cover with 12′ sheets of tin and add a 10′ gutter.
Jury-rig a spout or buy a commercial spout.
Add storage and a feed line to a trough protected from feral hogs.
Add more storage as needed and wait for the rain.