You can fill your water bottle at Oslo Airport free of charge.

If you bring an empty water bottle through security and want to fill it with water, you can do this in several places in the terminal. Immediately after the security there is a two drink stations. In the Domestic part of the terminal, you can refill your water bottle by gate A10, B2 and C4. On International flights you can refill bottles at the gate D4 and E12. In the Non-Schengen area there is a drink station between gate F17 and F19.

All filling stations are marked with signs.