Water
Water is critical in terms of life itself but even more so if you have a child with down syndrome. Without adequate water the body will begin to remove water from areas within itself and one of those areas is the blood system. If you are 5% dehydrated that effect can be multiplied several times by the body removing water from the blood.
We know from research that children with down syndrome have compromised digestive systems and weak immune systems. Makingt sure that your child has adequate clean water is a major step in maximising their health.
This is the first of the 4 pillars of wisdom regarding health.