Since this legislation has not yet been tested and negligence cases tend to be very fact-specific, what a court considers to be relevant in terms of the steps that the accused took will vary depending on the circumstances. Courts may look at things like the state of mind of the accused at the time.
In terms of steps, they might expect that a person who's about to consume intoxicants would want to know what the potential effects of those intoxicants are and would want to learn about those effects and how they can be more careful when they take intoxicants. A court could expect a person to remove their weapons if they're going to take intoxicants. They could expect them to want to isolate themselves from other people or to ask a sober person to supervise them, for example.
These are the kinds of things that we might expect courts to look at here.