a easy variation i found on the "Best pimple killer ever" project from Alyssa O.
i have this cup on my desk all the time and from time to time i dip some of the water anywhere on my face...Seawater is good against pimples, so you just have to mix yout own.
put a teaspoon of seasalt in the cup and add water until you have something like seawater....
now dip into the water and put it on the pimple.
from time to time (every second or third day) you add some drops of water to your mixture again, so to not have just salt someday. if it isnt used anymore, you can just let it dry again it save for the next pimple.