Yesterday the outdoor plants were outside from 9 am to 9 pm, about 50-60 degrees F, and they look happy and healthy.
It’s been about a month, and the soil was starting to get dry, so I went ahead and added plant food to everyone except Zeus, who has new soil. I used the recommended 1/4 tsp of plant food to 1/4 gallon, and watered gently from the top using a small secondary container, trying not to disturb the soil too much. I used about 1 cup for all the outdoor basils combined, and 1.5 cups fro Kepler.
For Zeus, I watered from the bottom every 10 minutes or so until the top soil felt moist.