As it's explained in the teachings, the container is the pratimoksha vows, the water is the bodhisattva vows, the reflection is the tantric vows. This shows how the later one depends on the previous one. To do this essential practice one needs to understand the pratimoksha vows. But just understanding them is not enough. One must practice mindfulness to cherish and guard the vows in daily life as one would the wish-fulfilling jewel.
Some nunneries have rules like the military.
There is the possibility of causing great harm to others' minds. But there is also no question about the incredible benefit sangha can offer to people in the world and to all sentient beings. You know this very well. Strong practice is needed. One must meditate on impermanence, death and the lower realm sufferings for months and years and years.