For the pinky, if you really, really want it to live, go to the store and buy the smallest baby formula mix you can find. It has to be soy. Prepare according the directions and feed once every 2 to 3 hours, which means during the night too...Not feeding at night will cause the pinky to die faster, but it should hang on for a while.

Just don't get too attached. That happened to me, and I now have a very, very sweet pet rat.

(the formula will work for mice too)