Get one of these, refillable butane torch. I use mine for repairing glasses and jewellery, etc. (silver soldering)
https://www.amazon.ca/Portable-soldering-Refillable-Lighters-Soldering/dp/B094XCP42J?source=ps-sl-shoppingads-lpcontext&ref_=fplfs&psc=1&smid=A30TVY0G9EJY0P