Water your plants once a day, just touch the soil with your finger and see if it is dry or humid. If the soil is humid, then leave it for that day and water them again the next day, The soil at the surface of the pot is always dryer than the soil at the bottom. Do not water them too much but neither too little.
A small sprig uses approximately 0.2 liters per day and a full bodied plant can easily use a liter per day. Still you can also add some nutrients to the water to have your plants grow even faster. So this isn`t necessary but does increase the harvest.