Here's a six year old picture pic of my remote reservoir. It's an Advanced Auto Parts antifreeze jug jammed into where you see it with a bungee cord for extra security.
I heated up an old socket and melted a hole in the cap, for the perfect hose size fit, running the hose to the bottom of the jug with a slightly angled cut at the end so it can not seal itself off.
I run the antifreeze jug half full and the radiator completely full.
This same jug has performed flawlessly for over six years now, the sticker is gone, and a jug like this with antifreeze included will now cost you about twelve bucks.
I did mine back then for about six.