just looking for some advice, im starting to we...

just looking for some advice, im starting to wean my ten and a half boy from the breast, ive droped the lunch time breast feed and tried to introduce milk via bottle,sippy cup, straw cup, cup but he doesnt actually drink anything at best he sipps from a staw then dribbles it all over himself. he is getting 3 meals a day plus his morning and evening breast feeds and water during the day. do you think he is gettting enough calcium/nutrients? when could i think about dropping another feed? will he learn to drink milk when he is actually thirsty? sorry lots of questions, can anyone help me?.