Advice from Canpol's experienced mothers.
In the beginning, it will be hard for both of you. Baby associates bottle with suckling milk, and with your warmth. First attempts to drink from a normal cup will end with spilling on clothes, therefore it's best to start with a training cup (you simply exchange teat for spout), and then continue with a non-spill cup or sports bottle with a straw. These steps will allow the baby to go without stress from bottle to a regular cup, without a lid. In the beginning, buy a small, handy cup. I recommend buying a cup with a stabile bottom. Your child will probably have a hard time learning to use the non-spill cup - he won't know, how strong he needs to suckle to make the food flow from the spout or straw (you can try taking out the valve from the non-spill cup). Therefore, you must be very patient and supportive. Learning to drink from a cup is already a stressful moment for the toddler, so spare his nerves from other unpleasant experience during this period. If you're planning childbirth, a longer trip, or moving to another place, postpone drinking training for another time. Don't try to wean him off the bottle radically. Start by giving him water from a cup during meals, but continue to feed him with milk from the bottle. Slowly substitute upcoming bottle feedings with meals fed with a spoon and drink served from the cup.