When you're playing solo on zombies, there's the Quick Revive Vodka when you first start. The Double Tap Root Beer on the alley. The Speed Cola on the bar room. And the Jugger Nog beer on the theater. The quick revive only gives away three Vodkas before disappearing from it's original spot. Basically 3 strikes (downs) and you're out so you only get down 4 times. The rest of the perks(sleight of hand,rapid fire attachment,and hardened) work more times after you go down so this helps a lot when using my hint on the BEST ROUTE on Kino der Toten. This DOES help a lot so go around the map and keep on getting these perks. Also, to survive longer, wait till you got at least 2700 points(money and this is how you spend it: use that money on 2 doors. First door on the upstairs and the door after that. Now you should be on the bar room where the MP40 is located. Now use the last 1000 to buy that gun and wait until you got 2500 and you should be able to open the next 2 doors. Turn on the power and start the link of the teleporter and keep the teleporter green up until you need to go pack a punch your guns.after pack a punching your guns, try getting all the doors open and go around the map killing zombies and getting more guns when needed. This helps on getting to rounds 50 and above.also on Multiplayer zombies(online) these machines give the perks out unlimitedly.
Hope I helped and keep the cheats and hints running people!
Edited: Jun 13 2012
Added by: Modder_Dude0_0 Jun 7th 2012, ID#5151