/ Bohuslšn:- camping gas/outdoor shops?
worst come, you can get cheapo gas-cartridges from Biltema (.se), but also quite a few of sports shops have them (screw-on, so MSR/Primus kind).
Any larger ICA or COOP supermarket will have gas cartridges.
There's a massive sports shop just outside Hamburgsund and a smaller version of the same shop in Lysekil. There's a Biltema just next to the motorway in Uddevalla and you may well be able to get screw in gas in many of the bigger petrol stations. I guess you fly in Gothenburg too? In which case you'll have loads of possibilities.
I don't think you'll have problems.
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