I use an 8 foot length of clear plastic tubing (3/8 inch ID from Home Depot for~ 10 cents per foot. One end into the PS unit and suck until the tubing is 3/4 full. Lower the end into a container and wala it will empty and the cost is ~ 80 cents.
I went to Advance Auto Parts to look for a battery squeeze bulb, and could not find one. The clerk showed me a $3.98 siphon with a squeeze bulb between two clear tubes. I bought one because it beat the taste of ATF.