A few recipes:

Fungicide

2 to 3 teaspoons - baking soda

2 to 3 Tablespoons - Oil

1 gallon clean water

Spray bottle works well.

Don't use if humidity % and Fahrenheit degree numbers add up to 140 or more. Might "burn" the leaves.

Slug spray

Ammonia - clear NON-sudsing

1/3 ammonia to 2/3's water

Spray on the slugs (like salt) in evening and morning, or if you are checking under rocks and heavy growth where they hide during the day.

Use sparingly around new plant growth, don't spray in the heat of the day.

Try silica sand in a wide band around your plants to slow down the slug attacks. Won't mold and safe for kids and cats!

Window cleaner

1 Tablespoon - White Vinegar

1 Quart - Water

Use in spray bottle.

Less streaks and film than ammonia products - but gets the dirt and finger prints off.