What event or scene do you mean with "good path journey"? Can you elaborate a bit?
You get water bottles and buckets from the water fairies a few rooms before entering the fire raid. A detailed explanation of the fire raid is in the walkthrough or in the #faq channel on our discord.
The second mine increases the gold income, but it adds to the same amount as the first mine. Which means that when you withdraw the gold from the first or the second mine, the other mine gets empty as well automatically. This is supposed to make it easier for the player, as he doesn't need to check both mines each time.