Three broken spokes all about 10-20 city miles apart and on different days thank goodness.

First one: fine this happens
Second one: What bad luck
Third: WTF.

Backstory: I recently acquired a Univega Viva Sport and after updated a few components (tires, handlebars and brake levers) and got it back on the road. Bike and other components are about 20 years old. All the broken spokes were on the rear wheel, which has a shimano 105 6 speed freewheel which happens to be slightly bent. The first two spokes were drive side about 8 spokes separated. The third non drive side. After the first I installed new spoke and trued wheel. After 2nd I read the Sheldon Brown article on spoke tension and decided to tighten all the spokes. I tightened a half turn and then felt that was as tight as I could easily go on the drive side, non drive seem to have significantly less tension, I know some is common but I am not sure what the difference should be.

Do I need to work on my spoke tensioning? Do I need a new wheel? I realize the bent hub is less than ideal (I'm trying to do this on the cheap) but could this be the root of my problem?

Also in the case of a broken spoke is there any first aid I can do so I can ride a bit, my wheel usually goes out of true and progressively gets worse. First two times it happened I was able to limp home but this last time I was halfway to work with no time to go back. Had to lock it up an ride the subway the rest of the way in.