I was building my 2nd one of these so I though I would post it as a "how to". Total cost was $3.98 and 15 minutes. The best bottle I have found to use is the 300ml Armor-all bottle. I looked at different ideas but found that the same one was best. I bought a new bottle and dumped the armorall into an different one.
1. Take the label off and wrap black electrical tape around the bottle in 4 spots. The purpose it to build up enough wraps to create a slot for the tywrap to sit.
2. I used an old belray fork oil bottle cap, others fit as well. Drill a hole in the cap so the hose fits loosely enough to act as a vent. Cut the end of the hose at an angle and slide it throught he hole so it will touch the bottom of the bottle. Retain it with a tywrap inside and outside the cap.
3. Paint the whole thing black with spray paint. To be fancy on this one I am going to mask off a thin vertical stripe so I will be able to see the coolant level through the white plastic. **** Don't use "plastic" paint. Regular paint stayed on for years but the plastic paint was horrible and doesn't stick to this type of plastic.
4. Install to the inside of the rad shroud (drill some holes on the inner part) with tywraps and fill about half full.
Enjoy. Cam.