It's a preventative maintenance thing. Check the spokes at 600 miles, it's part of the service then, but gets ignored by many. Check it fairly often, depending on the length of your rides, for the first few thousand miles. If you do a lot of short rides, check it every 500 miles. If you do longer rides, check it every ride or couple of rides until your first regular oil change. After that, you usually will not find one loose enough to stress about, but you will still find some that will take a 1/4 turn or even 1/2 turn, using a torque wrench to tighten to spec. I still check at every oil change, (5k for me), but haven't found a loose one in a very long time.
I zip tied at the spoke cross over points. That way if a spoke does come loose, it can't flop around. If you choose to do this, don't snug the zip ties up on the spokes, this can actually aggravate the problem, just loose around the two spokes is fine. You're not trying to tighten them together, just capture them so they don't flop if the nipple comes off and is lost.
When there is an opportunity, buy a few spokes from a forum member that has them for sale. If I recall correctly, there are 4 different lengths, so it's nice to score one or two of each length and keep those in your kit in case they are ever needed.