Ahhh morning sickness phase, I feel you! A few of us tried ginger tea or plain warm water with lemon, honestly the ginger really helped with the nausea, and sipping slowly throughout the day is better than chugging. For heartburn, avoid the acidic drinks and stick to plain water, milk, or coconut water instead; one of my friends swears by drinking milk every time her heartburn flares up. But since you're having both nausea and heartburn together, best to check with your gynae to make sure everything's okay and get some safe recommendations for your stage, sometimes they suggest specific things. Hang in there, the queasy phase usually improves after first trimester!