Ok SweetTrade, I just went outside and measured mine. The water storage is a white plastic 5 gal. jerry can, quick and dirty (it's dark, cold and wet outside) measurements of 13"x13"x8". It mounts on the same portside platform as the battery does in the lazerette locker, immediatly forward of the battery and next to the bulk head. The galley's storage position is immediatly forward of that bulkhead. There should be two wood bars on the platform that the water jug sits in between. Additionally, there should be two small hooks by or in the bars. You secure the water jug with a bungee cord that runs through the water jug handle. Strangely enough, the bungee is sufficient to hold it. It vents with a small vent opposite the fill spout of the jug, which has a cap you can loosen or tighten. The pump pulls water though a hose that runs through a hole in the fill spout cap.
As for the pump, I suppose you can modifiy it to use a powered pump, but the original pump was manual. Keep in mind that even with the galley slid out to working postition from its storage position, the water jug is no more than three feet from the sink, with perhaps 6-8'' of head. 23' boats are generally much more simply built than the larger boats - and that's not a terrible thing when you consider purchase/maintenance costs for larger boats' systems. When you measure for the hose, make sure the galley is pulled all the way out to ensure you have a long enough hose.
Jim Kolstoe, h23 Kara's Boo