Granted.

An infinite quantity of ice cold water now exists within the exact dimensions of your water bottle.

Water has mass.

Granted, it's now a portal to the bottom of the Arctic Ocean. Once you open it, a stream of water will shoot out with a pressure of 300 Bar. Enough to cut steel.
And it will. not. stop.

Granted, the water is frozen solid with no means of warming.

Granted.

You open the bottle and take a nice refreshing drink. It's wonderful. It's cold. It's got a unique flavor that's just perfect. You couldn't be happier.

You drink from your water bottle all the time. Since it's infinite you quickly find yourself sharing it with others. Soon everyone in town knows about your amazing water bottle.

It isn't long before tales of your water bottle reach the news. No one believes it at first, but people from nearby towns start to visit and are amazed. Everyone swears it's the best tasting water they've ever had.

Soon companies and scientists are asking to see and use your water bottle. No one can explain it. It's otherworldly. It's magic. You're offered a large sum of money for access to your water bottle. You're unsure at first but eventually you make a deal with a shipping company who provides water to those most in need.

Soon the water provided by your water bottle is know world-round. Although you don't have your exact water bottle anymore, you still have access to your water, which still remains it's out of this world taste.

Then you see it on the news one day. Mars, it's collapsed. The former planet is now just chunks of rock, hurled in every which direction. Some chunks are heading towards Earth. There is no time to stop it. You accept fate and take a sip from your water bottle.

Granted. It's infinite but comes out in barely a trickle and only fills up to an eighth of a teaspoon at a time so you can't just wait for the whole thing to fill up slowly. It's never quite enough to get a quenching swallow. Even if you're letting the drips accumulate in your mouth, it takes so long that your jaw hurts before a decent amount accumulates.

Granted, the water bottle contains an infinite block if ice that melts very, very slowly, releasing a few drops of cold water every time you try to drink.

Granted, you have a nice full water bottle. As you open it, it starts spurting water that freezes as soon as it reaches rest. The shock of ice on your skin causes you to drop the bottle. Quickly the bottle is covered in a layer of ice except for where new water keeps jetting out. Before you know it your home is encased entirely in ice. A few weeks later it's your whole town.

Granted, but it is endless because it supplies itself with water from your blood.