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>any advice
I cant really tell how much outdoor experience you have, but Im guessing about 0 and you're about to go full Darwin
then again thats your choice really
take a compass with you and a map of the region atleast
and some means of communication in case shit goes south (Im not all that familiar with the outbacks of sweden but will you have cellphone reception if you need it )
>Any advice on what to eat other than fish?
if you dont know what your native edibles are I'd again seriously reconsider your endeavor
atleast take an illustrated guide to your local edible plants and mushrooms with you or inform yourself on that topic beforehand