You have to let the soil dry well before watering, because if you double water basil, it will wilt. Here's a photo of my basil I have growing now. I let the container get very light weight before watering. I give them a dry time between the waterings. These are in one gallon pots and I watered them this morning. After watering they are heavy with weight and will be good for about 5 to 7 days. .
