Ur BM is sufficient for your baby  till 6 months.

breast milk remains the primary source of nutrition till 1 year of age. after that it reduces and solids are more imp.

Giving a baby younger than 6 months old too much water can interfere with his body's ability to absorb the nutrients in breast milk or formula. Rarely a baby who drinks too much water can develop a condition known as water intoxication. Water intoxication happens when too much water dilutes the concentration of sodium in the body, upsetting the electrolyte balance and causing tissues to swell.

because any liquid intake drops the breast feed that child takes. since it is the only source of nutrition for the child, dropping even one feed is not recommended at all.

Not required.