What you need:
1 salvaged, nice drum (or tub) from a washing machine
1 bucket working as a stand
3 screws with bolts to fasten tub and bucket together
some average tools
and some imagination
I have also used 3 tent pegs to stabilize the bonfire pit.
Step 1: Fasten the Stand
I have used my well-known tools and screws, that were handy and not used for other projects, but you may use any style of fastening that works.
Safety first: while working/drilling steel and such alike it is important to wear always protection (goggles, gloves, etc.). Be careful not to hurt you while drilling, sometimes you may experience some "slippery" while drilling: your drill could glitch on the metal surface. Sometimes a stripe of masking tape can help here: attach the tape over your hole target to keep your drill fixed in the designated area.
I have drilled 3 holes in the bucket and the tub. Then I have screwed this two together using some unassigned screws and bolts I had around.
Step 2: The Final Improvement
These holes can be used to insert some tent pegs to provide more safety. Again: wear your protection equipment while drilling holes.
Step 3: Happy Bonfire
And check safety and bonfire regulations with your town and keep a reasonable bucket filled with water in reach at any time.