How is the rain tile used? Is it facedown with face down tools and tents or is it face up? How does the rain tile get placed on a pile? Are the tools kept face up to buy or are that facedown and you do not know ? Are the 3 tools separated in a pile?
The rain tile could be put when you have the correspondant event card. You decide where (in which tile you will put). Then, it could be moved with another rain event card (theri is only one rain tile). The other way to block it is buying a tent. Unfortunately the first version of the game didn't have tents (in my case we just use a random token, but there is a print&play version in oldcasa website).
The tools are kept face up. You just buy the tool you need (and if I remember well these have different price).