How can i find out how many more bottles of Nuka-Cola Quantum I need to donate?

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I'm working on the Nuka-Cola Challenge, but as the bottles are few and far between I don't know how to keep track of how many I've already donated, or how many more I need to find.
When I donate any, Sierra says 'you've found more than 10...' or words to that effect, but I can't find any stats telling me how many more I need.
Do I just keep finding them and delivering, hoping I hit the magic number, or is there a more precise way to know?
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How many Nuka-Cola Quantum are there?
Nuka-Cola Quantums are rare items. There are only 94 loose in the base game (plus a 10% chance of finding one in a Nuka-Cola vending machine) and only a dozen or so more with add-ons. They are easy to see because they glow (only if HDR is enabled on the PC version).How do I get more Nuka Cola quantums?
Nuka-Cola Quantums can be earned by:What is the secret ingredient in Nuka-Cola Quantum?
Once inside, you'll learn that the secret ingredient is Nuclear Waste - yikes. You'll be able to find three lots of it in the room you're in.How do you make a Nuka-Cola Quantum drinkable?
Just combine cream soda, Coca Cola, and Mountain Dew. Or mix together soda with blue energy drinks to make Fallout's Quantum version of the drink. Fans of the game will also be familiar with variations such as Nuka Cola victory, cherry, and dark.Fallout 3 Nuka-Cola Quantum - 70 bottle locations
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Images: Molly Champion, Felicity Tai, Ann H, Magda Ehlers