Drugs or inoculations to prevent malaria, polio, hepatitis A, tetanus and typhoid are available from your doctor, hospital travel clinics and the Medical College of Wisconsin. Your travel agent can get you promotional booklets on African safaris, or check out the large amount of information available on the Internet. If you have a bad back, the rough, bouncy roads in the bush can be hazardous. Food and water are not problems in the bush.
Bottled water is always available.
English is spoken by most people in Botswana and Zimbabwe. Pack light because laundry facilities are available. For a two week trip, three pairs of trousers, three shirts and a pair of comfortable walking shoes should be adequate. I found cargo pants with big pockets helpful. Cool nights made a sweater welcome, although all the camps provided warm ponchos for animal drives on chilly nights.