I've tried a few methods over the years. I would purchase VP M-1 meth in five gallon containers and pour it (with a funnel) into empty spritzer bottles.. And from the spritzer bottles into the WW tank..
This was a pretty crappy method IMO as there was always some spillage.
I decided to try using one of the fuel containers for my RC cars. It's 1.25 gallons and has a huge fill hole on one end and a on/off type switch on the front (to prevent spillage).
You can hold the container completely sideways and it doesn't leak a drop until you press the button.. Pretty slick.
Just thought I'd share.
