African Rift Valley Money
In Tanzania the currency is the Tanzanian Shillings (TZS) and there are approximately 2000 TZS to a US$ and 3000 TZS to a £. To get an accurate conversion rate have a look at currency exchange sites such as http://www.xe.com/currencyconverter/. On arrival at Dar airport there are ATM machines that work for overseas credit and debit cards.
In Malawi the currency is the Kwacha (MWK) and there are approximately 650 MWK to the US$ and 1000 MWK to the £, but again look at currency exchange sites for up to date information. If you want to take money out using your credit or debit card then you need to find a Standard Bank. There is one in Mzuzu which you pass through on your way to Nkhata Bay if you want to stop to get some cash from the ATM.
If you are going to use your credit or debit cards in Malawi then please check that your bank has been notified that you will be travelling. The alternative is to carry some £ sterling or US$ with you and these are easy to exchange for local currency at the borders.
You should need very little money though because the full package or non-packaged group payments cover nearly everything. However, you need to carry US$125 with you to cover the costs of your visas on entry. If you are renting dive equipment for your dive training or diving on Lake Malawi, this can all be paid in advance. Other than this it is useful to carry a small contingency sum and any money needed to buy additional soft drinks, snacks, souvenirs or gifts.