He usually was high on drugs
Sometimes he had a heavy booze
After all he was an acid head
To be honest he had fuck-all to lose

Han var ofta hög på droger
Ibland hade han ett fylleslag
Han var trots allt ett pundhuvud
Och levde dag för dag

To hold the rhythm and original sense of the poem, I believe the last sentence needs to be changed.
'Had a heavy booze' is defined as drinking a lot at a party, so I believe 'fylleslag' would be appropriate.