You can leave the plants in their pot if you continue to water (I persume the stem is still green ?). You can either plant them now or in fall.

They will come back and bloom in late june next year.

Well, I haven't watered them since I took them out of the house at Easter. No, stems are not green...are the bulbs okay. Or, what should I do now? Store the bulbs? eek, did I mess them up?

I would plant them now rather than store them, but then I tend to forget plants when I store them :) If the bulbs are still alive, then they will be dormant so planting anytime is fine.

How do you tell if the lilly bulb is "still alive?" If not, are they still good?