Couple of different issues - First, using the Jiffy pots to begin with. Many discussions here about all the problems with using them.

Second, watering. Watering from the bottom, NOT the top, is the preferred approach no matter what container used. That is why you need some sort of water-holding container for them to sit in. Any flat pan, baking dish, those disposable aluminum cake pans, etc. will work.

However the containers should never be left sitting in water. That causes the seeds and roots to rot.

Hope this helps.

dave