Banks in major towns are open from 9am to 2.30pm most days, closing at noon on Wednesdays and 10.45am on Saturdays. Required for all countries except Commonwealth members, some western European countries, South Africa and the Unite States. The rainy season is from November to March, mostly by way of afternoon thunder storms. Days are usually sunny and warm, but nights are cold. African nasties such as bilharzia and the tsetse fly have more or less been eradicated.
Tap water is usually safe.
There are hospitals in most major towns and clinics in villages. Botswana isn't cheap. Buses and trains will not take you to the most interesting places. Car and 4WD hire rates are high. Many of the lodges in the Okavango Delta are of luxury standard and fly their clients in.