Traditional Zambian food revolves around one staple, maize, served in one form, nsima n'SHEE-ma. Nsima is basically a type of thick porridge, rolled into balls with your right hand and dipped into a variety of stews known as relishes ndiwo, umunani. Those who can afford them eat relishes of beef, chicken or fish, but the many who can't make do with beans, tiny dried fish kapenta, peanuts, pumpkin leaves chibwabwa and other vegetables such as okra ndelele, cabbage and rape. At breakfast, nsima can be served watered down into a soup, maybe with a little sugar. Local restaurants will serve nsima and relish for less than 5000K $1.
Western food has also made major inroads, particularly in major cities, and in Lusaka or Livingstone you can find almost any food you like. Fast food — including burgers, pizza, and fried chicken — is very popular in Zambia. Bakeries making cheap fresh bread are a common sight in towns, and rice from Chama provides an alternative staple if all the maize starts to get to you.
For sit-down meals, ethnic eateries are popular. In Lusaka, especially noteworthy is the Sunday brunch at The Intercontinental; and if you like Indian food, be sure to hit The Dil. Of course, game parks often cater to wealthy — usually foreign — visitors; therefore, high-quality Western meals can be found easily. Along the major roadways, you will find "tuck shops" featuring packaged cookies or take-away meals — meat pies or sausage rolls, for instance — which may or may not satisfy you.
Finally, in terms of hygiene outside the major cities, you are unlikely to find a proper washroom with running water. You will probably be given a bowl of water, a piece of soap, and a damp towel. Therefore, some travelers bring small bottles of anti-bacterial hand soap with them.