Q.Norfolk Island Pine Problems
I have a Norfolk Island Pine that is badly stressed and is dropping leaves and branches. We got it for Christmas last year, and it was doing all right just dropping a few bottom fronds until a couple of months ago. Now it has lost probably 20% of its foliage, which comes off brittle and dry. When the problem first started happening, I tried watering it and feeding it some worm tea and fish emulsion, but the process only seems to have accelerated. What am I doing wrong? I am using the water we use for our outdoor fish pond, because I have read that chlorinated water is unhealthy for it. Are the chemicals I use to dechlorinate the water unhealthy? Do I need to mist it? The soil seems slightly damp but not wet a quarter inch down. How can I save it? This is an indoor plant.

Norfolk Island Pines are a tropical plant and need humid conditions to do well indoors.
I would recommend watering with either distilled water or tap water can be set out for 24 hours before using.
Water the plant only with the top inch or so are dry. Check the soil, don't water on a schedule.
Here are links to refresh you on the care requirements.
https://www.gardeningknowhow.com/houseplants/norfolk-pine/norfolk-island-pine-care.htm
https://www.gardeningknowhow.com/houseplants/norfolk-pine/norfolk-dropping-branches.htm