Help Constipated baby

My LG is constipated, she’s straining and only passing little firm nuggets. I don’t know how to help her because she refuses to drink water. I’ve tried open cup, tomee tippee sippy cup, straw, bottle, she won’t drink from any of them. She was having fruit puree and yogurt for breakfast which I think was keeping her bowels in order but now she is refusing the spoon so we’ve switched to melon or mango fingers. She’s getting fruit and fruit juice from that but it’s obviously not enough. Her food intake has been really low for at least a week partially teething. Still EBF and getting lots of milk feeds What can I try next? I don’t want it to get worse or for her to be in pain.