Of course you can go overboard- and listen to this - the MAJORITY of what is on the market is unlicensed CRAP.
Observe your birds drinking. I do ours. They drink Strike & Gemthepax like normal water.
But Yes - a lot of our stuff goes on the corn & clear water in the drinkers. Take "Strike" - its never advertised on the tub as going on the corn - only on the drinker. But since I started writing about it on the corn I know sh!t loads of blokes have phoned Gem up and asked if its ok to do so. Of course it is, because its 100% natural goodness. It is physically IMPOSSIBLE to overdose on that or Gemthepax