Objects are not visible through the glass in blender, how to fix it?

Question

Blender

I decided to make a can of cola, at first everything was fine, but when I added cola inside, it was not visible, I decided to check it with ordinary cubic meters: the same thing, only the background is visible, what should I do?

Answer 1

+ throw light and environment and you will see your water
render cycles

Answer 2

Go to render settings. In Cycles, glass automatically works as it should, but this question would not exist then, which means you are in Eevee. Next is Screen Space Reflections. Turn it on!
There will be Refraction. Turn it on too!
Then go to the object material settings. Going down, you will see Settings, and there - Blend Mode. Set to Alpha Blend or Alpha Hashed.
In theory, it's done.