This was a simple, free raft that ended up being surprisingly successful. By now, of course, it is recycled, the jugs gone off to make the next generation of mittens or yo-yos. But it served its purpose as a fun one-day raft on the lake. It took about 30 minutes to construct with on hand materials. I am in the process of building an actual boat, and this was done partly for the practice in instructable-writing, and partly for the fun of it.
There are several other instructables on this site that deal with boats/rafts built from recycled materials, most of which I didn't know about until I posted this instructable. Still, I see no harm in putting this out there.
Step 1: Materials
I had been collecting plastic recyclables for weeks, and so I had more than enough milk jugs to make this. A bit of math told me that around 30 jugs would be enough, but this number, like the entire venture, was inexact. In the end I used 34.
Other than than the plastic milk jugs, there were few parts. Two old broomsticks were used as well as one 4 cm wide, 1 meter long length of PVC pipe.
Zip ties were used to hold everything together. In the end I used 25.