DS is nearly 15 months and refuses to drink cows milk. I've been trying him with it since he turned 1 but he just spits it straight back out ( I've never seen him do this with anything else -he is a dream to feed as he'll literally eat everything ). So far I've tried: putting it in his sippy cup, bottle, normal cup, mixing it with formula, warm, cold ... I'm out of ideas! He just really doesn't like the taste 
Has anyone else had this? What can I do to make it more appealing? Really struggling financially and we're going through a tin of formula every 8 days so need to get him switched over.