I don't have the Killer but when I looked at the cup in this clone, it looked like the one I have in my Ebaron dripper. The ebaron and Killer uses the same cup and setup. If this is your first time using this type of RBA, make sure you prime the wick before screwing on the bulb top part. I shouldn't need to change out the coil and wick much, I know that my Ebaron wick and coil usually lasts for a month unless I just want to change ohms. I would just have extra non resistance, resistance wire, and some wick just incase. It's pretty easy to set up, down the line getting spare cups would make sense down the line. You shouldn't have any problems for a 7 day trip. If you want to change juices, you just take it apart and give it a good run through the sink, you won't be able to dry burn it because you won't be able to see the wires glowing. The bulb part has to be screwed on to complete the connection of the negative wire. Just dry it the best you can and add the new juice and vape it til the watery taste goes away.