If you want a custom drink bottle made there are lots of places on the internet that will help you do it, but before you head out in to the world wide wilderness there's a few things you'll need to decide.
Do you want bottles to use for a one off occasion, or do you want something more durable that you can re-use? Are you looking for a company that can regularly produce batches of your bottles for your awesome new soda, or something more casual where you can just re-order when your stocks of that sweet team flask run out? Once you've decided on those, you need to get your design ready and find a supplier.
There are loads on the internet but depending on which type you've chosen there'll be different costs and requirements.
Most suppliers will charge you a base price to set up the printing for your design - this will be the same regardless of how many bottles you're going to order.
The more bottles you order, the cheaper this cost will work out per bottle.
So if the setup cost is $50 and you order ten bottles, that's $5 per bottle! If you order 100 it's only 50c a bottle, for a 1000 it's 5c a bottle.
You can see how it already makes sense to order as many as you can in one go.
A lot of suppliers will also have a pretty strict minimum order.
If you're going for disposable bottles with printed labels then the minimum could be as low as one box - between 20-30 bottles.
If you want a re-usable drink bottle then the minimum order is likely to be more than that - in the region of 150-200 bottles.