WB - I use the 12VDC TANKLESS portable air compressor for my blow out routine AMAZON. Without the tank the air pressure comes up slow and gives me a chance to get inside and open up a facet before the pressure builds up. I just drain the low drain points, blow out the lines and pour a tad of pink stuff down the traps when on travel in cold weather.
You can go back to using water by just refilling the tanks... Easy five minute job blowing out the lines using the air compressor and adapter on the city water inlet.
Your B&D air inflater may be just the thing to use. Try it first before going to buy something else.
Also after seeing Don's post a week or so back his idea has big merit for me. I have just the spot in my OFF-ROAD trailer here mounting this Window fan with thermostat on an outside cabinet wall near the floor to give me positive air flow through-out all of my floor cabinets is a great idea for me. This will move the inside trailer heat back behind all of the cabinets.
Roy Ken