How many do you have in your hometown? (This is the grammatically correct way to ask about the number of something someone has in their hometown.)

We don't have any information about the trip. (This sentence is grammatically correct.)

Are there any ways to cure rabies? (This sentence is grammatically correct.)

I have never seen any aircraft like that before. (This sentence is grammatically correct.)

There aren't any eggs in the fridge, so I must buy some. (This sentence is grammatically correct. You can also say "There are no eggs..." if you prefer.)