How do I...

[Revontulet]

...use purification tablets?

Just started. Looks really cool. This is the first of many questions, and I would be doomed without you guys -- the Steam community.

So, I have purification tablets & dirty water bottles. How do I put these two things together?

[Morbious]

Make a cooking stove and then use the cooking stove. Click on the water bottle in the menu. =)

[Combat Ready]

With 2 purification tablets and 1 Dirty Water in your inventory, press the Tab key and select the Craft menu at the top of the screen.
Then, click on "Water Bottle" to create a water bottle.
If you do not have purification tablets, you can boil the water with a cooking stove or other cooking utensil.

[Revontulet]

Thanks for the above.

Next question:

Is there a way to move stuff between your pockets and the backpack?

[Combat Ready]

This can be done with the middle click of the mouse.