I use the Walmart 3 3/4 ounce measuring bottles. I then store it in a small plastic Tupperware dish in case of an accidental spill, but the bottles haven't leaked yet.
I store 4 bottles in the Tupperware dish in my truck under the rear seat along with some hand cleanaer and a couple of shop rags should the need arise. I also carry a small pair of pliers as I have had a hard time opening them after they were filled.
I have a small plastic tool box that I keep behind the drivers seat. In there I have a couple of pints of Stanadyne and a baby's bottle. The baby bottle has graduations in 1/2 oz increments and I have labeleled it with correstponding 2 gallon fuel increments. When I pull in to fuel I check the DIC to see how many gallons it will take to fill up and then measure out enough into the baby bottle. The baby bottle has a wide mouth so it is easy to pour into into it withot spilling and it is also easy to pour from into the tank.
Using an old Sta-Bil bottle that is labeled for the additives and can be used to measure it out. Labeled the bottle for oz per gallons of fuel and check the DIC before refueling. Put some 3m commercal velcro on one side of the bottle and stick it inside at the back of the bed (so it doesn't fly around) along with a pair of gloves.
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