Sixty Fiver is right on!
The best way to minimize the chances of breaking a spoke on any distance of a ride is to be sure there is no metal fatigue in the properly tensioned existing spokes. I am not aware of an easy way to know the existing fatigue level other than to start out with new spokes. Having not being used they should not have metal fatigue. Maybe you know the history of your spokes and can 'guess' there hasn't been much use so as to cause fatigue. The metal in spokes fatigues by being put through repetitive stress cycles as you ride the bike, one stress cycle for every wheel revolution. The metal usually fatigues to the point of breaking at the spoke head bend but also can at the threads. Best way I know to minimize that is to use double/triple butted spokes (as opposed to straight spokes) and (here is the most important part) make sure the spokes are tensioned properly. That encompasses several things but critical is that the spokes be under high tension but not high enough to damage the rim.

If you have a wheel with DB spokes which are properly tensioned you have the most durable and strongest wheel possible with the existing hardware you have! And You have the least likelyhood of having a spoke break or the wheel go out of true!