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Dr. Stone, season 1 episode 13 «Masked Warrior»: air date September 27, 2019. Episode overview, season trailer and the cast of Dr. Stone.
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.