• To use cheaper canteens, you must spent a certain amount of credits in canteens before using them.
  
  
• All classes concerned must use the same Power Up Canteen.
  
  
• The price can be lowered to 5 with the medic, for only 3 canteens.
  
  
• Works for all types of canteens, as any class.

> Step 0 (only as Medic) : Buy 1 Canteen Specialist upgrade and do not leave the upgrade station until the end of step 1 bis.
⠀
⠀
⠀
⠀
⠀
⠀
⠀
⠀
⠀
⠀
> Step 1 : Buy 1, 2 or 3 Teleport to Spawn Canteens if you want 1,2 or 3 Canteens with a discount (3 recommended).
⠀
⠀
⠀
⠀
⠀
⠀
⠀
⠀
⠀
⠀
Important: You must do this with a class you are not going to play with, but you can do it with multiple classes, this means you can stack up to 24 canteens (8*3).

> Step 1 bis (only as Medic) : Take back your Canteen Specialist upgrade. You can leave the upgrade station.
⠀
⠀
⠀
⠀
⠀
⠀
⠀
⠀
⠀
⠀
> Step 2 : Pick the class you want to play with for the next wave and buy 1,2 or 3 canteens, at full price (3 recommended).
⠀
⠀
⠀
⠀
⠀
⠀
⠀
⠀
⠀
⠀
Note: the number of canteens you bought here will determine how many canteens with a discount will be refilled. If you bought 3 canteens at Step 1 but only bought 1 at Step 2, only 1 canteen will be refilled as you perfrom Step 4. (you will still have the other 2 in stock for the next refill, but still one at a time)
⠀
> Step 3 : Use your canteens as usual.
⠀
⠀
⠀
⠀
⠀
⠀
⠀
⠀
⠀
⠀
> Step 4 :

• A. At the end of the wave, switch to another class and switch back to your desired class.
  ...OR...
  
• B. Use the 'retry' command within the wave to refill them instantly, Only available for people that reconnect FAST.

And repeat step 4 until you have no more Teleport to Spawn Canteens
⠀
⠀
⠀
⠀
⠀
⠀
⠀
⠀
⠀
⠀
Note : At Step 1 you can buy canteens for every 8 other classes you won't play in the game, giving you a maximum of 24 canteens.
Of course you are free to buy far less than this.
When all the canteens have been consumed, simply repeat this process from Step 1.

• Step 1 : Buy the 10 credits canteens (Teleport to Spawn) in classes other than the ones you will use your canteens with.
  
  
• Step 2 : Pick the class you want to play with for the next wave(s) and buy 1,2 or 3 as usual (3 recommended).
  
  
• Step 3 : Use your canteens whenever you feel like it.
  
  
• Step 4 :
  
  • A. At the end of the wave, switch back to any another class, then back to your desired class.
    ...OR...
    
  • B. Retry within the wave if you don't have any canteens left and need some.

• Step 1 : Any canteens bought here will be stacked into a queue.
  
  
• Step 2 : The type of canteen bought here will convert to the same type all the canteens in the queue. Plus, the number of canteens bought here will define by how much you will refill your canteens in step 4.
  
  • Example : If you only bought 2 canteens here, then when you will be out of canteens and perform step 4, only 2 canteens will be taken from the queue.
  
  
• Step 3 : Use your canteens, whenever you'd like to.
  
  
• Step 4 : As you disconnect & reconnect or switch classes, converted canteens from the queue will be added into your inventory, for only 10 credits each. Repeat this until your queue is empty, only then repeat the entire process.

• Always start your queue with the medic if you are not gonna play with him, as the canteens can be lowered to only $5.
  
  
• Try to make your queue as big as you can, as you can't extend it once you performed Step 2. But also don't forget to upgrade your weapons and your class.
  
  
• Multiple classes can benefit from the cheaper canteens. You can chose which classes you are going to play in advance, and thus not using them to extend your queue. You will be able to switch between those 2 classes as long as you allow the 2nd class to pick up the canteens from the queue, which is done by performing Step 2. Read next note to avoid a surprise.
  
  
• The queue works as such: the first canteen added to the queue will be the first one to be removed, and so on. So if you have multiple classes taking canteens from the queue, one of them will be allowed to take the canteens from the other one, but not the opposite !
  
  
• As most (if not all) upgrades are modulo 50, it is recommended to make the queue as long as such : 5, 10, 15 or 20, not really important but it's useless to make a queue of 6 as you will have $40 left for nothing.
  
  
• One Canteen (the action item) = one queue, there are 4 types of canteens : Battery, Kritz or Treat, Stock & Crafted. So you can stack 4*24 = 96 cheaper canteens at once. You can create multiple queues and switch canteens (the action item) to refill in wave with no retry. However there is a limit of canteens that you can buy before crashing.