You can generate address in a wallet or use this quick setup:
1. Download this web wallet from its GitHub. (Clone or download > Download ZIP)
2. Disconnect the internet connection.
3. Open the locally downloaded site (double-click index.html).
4. Generate new address: New > Address > Generate
(Save your private key in 2 or more places. If you lose it you’ll be unable to access your funds. And don’t give it to anybody.)
5. Close the browser.
6. Connect to internet.