Prepositions of place tell us where something is at: 

I placed the water bottle onto the table. ( I use the preposition onto as there was movement.)

Now the water bottle is on the table. (There isn't any movement with it at this time.) 

Jeff jumped into the pool. ( jumped into - there is movement.)

Jeff is swimming in the pool. ( He is inside the pool.) 

I poured juice into the glasses. Now the juice is in the glasses.