Laws and regulations
Spirits regulations (BrStv)
Here you can directly go to BrStv. The online legal text available on the website of the German federal ministry of justice (Bundesministeriums der Justiz) is not the official edition. You can only find the official edition in the German federal law gazette (Bundesgesetzblatt).
Hazardous substances legislation
The storage of combustible liquids is controlled in the safety at work act. You can find further information here.