I agree, bottle aren't easy to use for some rabbits and the position to drink from a bowl is a lot more natural (try to imagine yourself drinking from something which gives you only a drop at a time by twisting your neck upward and to the side and having to push a metal ball with your tongue ^^). Also, a lot of bottles tend to leak eventually and the metal part is hard to clean which means mold can grow there.
Like Blue eyes said, just chose a heavy bowl and put it in the corner of the cage, out of the way (I use a classic ceramic bowl and in 10 years, it has never been knocked over).