Drinking help

Bea

My little one won't drink out of anything but a bottle or a bottle type sippy cup which you have to suck to get the liquid out . I'm trying to teach him to use a staw cup but he won't even try to use it. He won't touch the free flow ones either. He will use a sports bottle one but trying to get him to use something like the staw in the house and sport bottle when we are out. Any tips would be greatly appreciated. Thank you ☺