This is a tried and true method for sure. Distilled water is a good choice – 2 sheets of paper towel on the bottom, 2 sheets over the seeds (not to wet). You can cover with an additional paper plate. Make sure you don’t let them dry out. Time to transplant when the tap root is just about 1cm out of the seed (you don’t want the root overexposed to light or air). Check the seeds 2 – 3 times a day (at least twice to make sure they stay moist). When the tap root is ready, place it facing down into your planting medium.