You don't say what time you arrive, but there will be somewhere at the airport that you can buy some water and basic snacks.
21 March is Independence Day in Namibia, but most petrol/gas stations have a sort of mini supermarket attached (especially in Windhoek and on the major roads), so you should also be able to stock up there. Do be sure to carry more water than you think you'll need, as even in March, it still gets hot in the day.
Enjoy - Namibia is a wonderful place that has a very special place in my heart, so you're in for a treat!
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