Digestive enzymes need the proper amount of gastric acid at the proper pH level in order to break down food.
Take the lemon water separate from food (30 mins. before or two hours after eating) so as not to cause an increase in feeling of acidity.
Also you might try avoiding certain foods like, fried, spicy (like hot chilies, etc.), garlic (especially raw), vinegar (except for apple cider vinegar), coffee/tea, mustard, large beans (such as kidney, pinto, etc.), large quantities of nuts. Just pay attention to how you feel after eating and try to see if you can identify foods that are creating extra problems.
Foods that may be helpful for the stomach are lightly cooked vegetables (especially squashes, pumpkin [if you can tolerate the sugars], green peppers, onion), long grain brown rice, oats (if your body tolerates them). Other foods really vary from person to person, sometimes fermented foods can be good, sometimes they can increase symptoms of acidity.