It wont be bad to your weight loss... But you should avoid unnecessary products with additives, even if they seem harmless, because if you're always eating or drinking a certain product, you're accumulating the same additives and dont giving time to your liver to get rid of them. Accumulated additives can lead to diseases at long term. Plus, it's different when you have pure water and water connected with other substances, it doesnt fuction the same way in your body. It's always better to your body to drink pure water.