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.
You're going to make 
Ruri-nee drink that?
هل ستجعل أختي روري تشرب ذلك الشيء؟
Und das wollt ihr Ruri echt verabreichen?
¿Y quieres que Ruri se beba eso?
¿Y quieres que Ruri se tome eso?
Et tu comptes
donner ça à ma sœur ?
E voi vorreste farle bere a mia sorella?!
Você vai fazer a Ruri beber isso?
Вы что, собрались напоить этим Рури?