Give buds a bath?

I got some plants 3 weeks away from harvest and I think I got some bugs like aphids or some other small bug. I hear about water curing so I was just wondering if a quick bath in a tub of water would remove the bugs and then go on to a regular dry and cure.

how bad would this hurt the buds?

Well, water won't hurt your buds, but it won't hurt the aphids either. They're smart enough to hold their breath. But if your buds don't dry out well enough, you may grow some gray mold. So then you would have buggy, moldy pot.

That would suck.

Better way is to spray your plants lightly with Neem Oil, or Azatrol, or some pyrethrin pesticide. Spray now and again in 5 days, and that should take you the last 3 weeks.

HTH