I'm pretty sure that there would be plenty of people who would sell you the copper you need to make your arrow tips. Use the Trade and Market Hall located on the forums and make an in chracter post that you need some of the items and would be willing to pay for them.
About the rain, I think that it really depends on the character. For example, Caldiir doesn't mind getting wet, and would NEVER take a sip of ale. He considers it to be for the weak and would never drink it. However, Magnus, my dwarf cleric would probably hate to get his metal rusty so he would go inside when it's raining and would drink a WHOLE lot of ale.
