All that’s needed to make antibiotics is alcohol. The best way to get some is to win the Grand Bout, which the Senku and his kingdom will also need to do in order to keep Magma away from Ruri and give her the drug.
I'm incapable of fighting 
except in earnest.
.لا يسعني سوى القتال بصدق
gebietet meine Natur mir,
fair zu kämpfen.
me es imposible no pelear en serio.
soy incapaz de pelear si no es en serio.
moi, je ne sais que
me battre de façon honnête.
io resto un uomo che sa combattere solo lealmente!
eu sou incapaz de lutar quando não
é com toda a minha sinceridade.
я могу сражаться только
честно, лицом к лицу.