Did you do anything different to them?
That may be a problem. I’m a less is more grower. I keep my plants hungry and thirsty. I always feed at half the recommended rate and I barely water my plants.
I water the plant every 2-3 days. Once a week I completely soak the plant by either watering to runoff (you have to water slowly for coco in fabric pots) or actually submerging the pot in a bucket (my preferred method, but you can’t always do it.). I gauge my plant by lifting them up to feel thier weight. It might take a bit but you’ll soon be able to tell when they need watering.
So, if you haven’t already and the pot is dry, give them a good soak. At this point, I don’t believe that would hurt them.
If you’re distilling you’re own water, remember that most of a plants immobile nutrients are obtained from the water. There will be none in distilled water. I don’t know that this problem is caused by your water. You’re probably okay with Happy Frog. That’s what I use and I don’t have any issues. Just a heads up.