Just started and already unhealthy

Hi! I just started my click and grow 2 weeks ago and my lettuce started to grow really fast! Now some of the leaves look unhealthy like the plant is dying. What could be wrong?

I used bottled water because we have a water softener so I didn’t think that was good.

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Welcome to the community @Jengoodrob!

Sorry to hear that, difficult to say what has gone wrong without seeing the plants. If possible, please add a picture of your plants so we could be more helpful.
What is the temperature range?

Water softener should be fine to use. What kind of bottled water did you use?