I used a manual transfer pump: the kind you can pick up at the auto parts store that screws onto the bottle in place of the original bottle cap. Worked great. The only tricky bit is that the refill hole is a tube that goes in for an inch+ (for the overflow level check), and you need to find a plastic/rubber tube that slips into there nearly perfectly (and then adapt that to your pump tube. I don't remember which size worked for me, I just went to the hardware store and bought small lengths of several small diameters.
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