Lemon water can be helpful as a supportive thing for UTI kasi acidic siya and some of us mums swear by it para sa comfort, but honestly sis, UTI really needs proper antibiotics from the doctor kaya please have it checked ASAP if you haven't yet, drinking lots of water (plain or with lemon) is good habang naghihintay ng appointment pero hindi siya enough on its own. Hope you feel better soon!