Babies have sucking needs - to aid digestion and for emotional security and growth. There are many reasons why a baby is unsettled or crying. It is very rare for there to be not enough milk if the baby is being breastfed in a natural and unrestricted way. The breast milk is always perfect for the baby. In hot weather the baby may be thirsty and will demand more frequently.
Breast milk has a low solute load and is a drink as well as a food.
Short extra feeds will supply the baby with a drink . Like adults, babies will burp when they need to. So giving water is not necessary to aid burping. Babies who have their physical and emotional needs met, will feel secure and loved. It is natural for the baby to have close contact and touching.