No, it is not possible to add weight or mass to water on an atomic or molecular level in a way that would cause damage to the Earth it sits on. The mass of water is determined by the number of atoms or molecules it contains, and it cannot be altered without changing the composition of water itself.
Water is a relatively light substance, and its weight or mass alone is not capable of causing damage to the Earth. The weight of water is typically measured in terms of volume, as water density is approximately 1 gram per cubic centimeter (g/cm³). To have a significant impact on the Earth, an enormous quantity of water would be required.
However, the effects of water can be significant in large quantities, such as during floods or tsunamis, where the sheer volume and force of moving water can cause damage to the environment and structures. But in these cases, it is not the weight of the water itself that causes the damage, but rather the energy and force associated with its movement.
In summary, the weight or mass of water alone, at the atomic or molecular level, cannot cause damage to the Earth. The effects of water on the environment are typically a result of its quantity, distribution, and movement, rather than its inherent weight or mass.