Lackey's Seducing Survival Odyssey

Got to chapter 6, I don't understand this story. He gives people energy drinks and antacids to heal sickness and builds a fire to make rain. THAT'S NOT HOW IT WORKS!!!!!!

Should I read the prequel before starting this one? It only has 33 chapters, so it doesn't seem like much can be explained

Today, two chapters were repeated. Can the author at least be faster with dropping the chapters?  So, I've actually read only two new chapters instead of four.