We started switching to a straw cup around 9m, he was completely off the bottle by 13m, and it could've been sooner but we were lazy 🙈 A few weeks before his birthday we started mixing milk in with his formula, gradually increasing the ratio until it was all milk.
You can put breast milk or formula in a sippy cup or regular cup. But baby's digestive systems aren't able to process cow's milk properly properly until they're at least a year old.