Bottled Mosi has been known to have furry unidentifiable stuff floating in it. Either stick to the tinned stuff canned in Mauritius or learn the African salute where any bottle of consumable liquid is held up to a light source and inspected before imbibing. Never had much problem with Rhino and others from Northern Breweries and quite frankly found they make better beer than the bloody awful Mosi.
As in most African countries, corruption is endemic among anyone connected with government. Most folks are friendly and helpful apart from obstructionist (un)civil serpents. This was under Chiluba so not certain if things have changed, but wouldn't hold my breath.
The beef is good (though the Zim beef was better, unfortunately no longer obtainable) and if you're in rural areas you'll get fillet at a really good price as it's not much in demand, being considered tasteless and not chewy enough by the locals. Pretty much lived on the stuff in my time there.
The GM of the Lusaka Holiday Inn is a skydiver and knows aviation. He's a good bloke and can pass on up to date advice once you're there. Name of Adrian if you chance to drop by.