mass of the Moon = 7.36 × 10 to the 22 kilograms

mass of impactor=1000 Kg

The comparative mass of the impactor is infinitessimally small compared to the mass of the moon. It would be absolutely impossible for such a minute collision to have any effect on the orbit of the moon. For such an impact to have any effect, the impactor would have to be moving at a large % of the speed of light, and we're not there yet.

If, however, NASA finds water, the impact on possible exploration of the solar system could be staggering.

NASA wouldn't have to carry mass to the moon, they could make the fuel and life support essentials in place, and carry them to Mars as well, as the moon's gravity well is much more shallow than the Earth's.