Hi N.-
Most of the moms have the same advice. My son did the same thing. It took him about 2 months of me giving it to him everyday, until he finally started useing it regularly. So my only advice is it hang in there and be patient. Every one is different, but eventually, they get it. And now he uses both the straw sippy cup and the regular one.
As far as our routine- we watch Seseame Street in the morning together. Then I kinda do my own thing- get ready, take a shower and them put him in the bath, so he has time to play with his toys( not like his night time bath) He will play with his toys by himself and them I will sit with him and pick up different toys and repeat what it is about 10 times and do that with a few different ones, but the same ones for a week. Now if I ask him to go get his Monkey, he will crawl and get his monkey. We do that with colors and reading. i only show him the pictures and point out the objects, Like see Elmo, ball, red ball, Elmo has the the red ball. and point as I talk. Nathan also loves being outside, and now that its warmer, we try to go for a walk and let him see the flowers, birds, what ever we see, we stop and I repeat the words and colors.
have a great day and I hope everyones thoughts help you with some new ideas!