Blend cottage cheese until completely smooth and no chunks. If your blender isn't working put lemonade in to help.
Beat cream cheese until fluffy with a hand mixer.
Next, mix in cottage cheese and lemonade if not used above.
Add powdered sugar, vanilla, lemon zest, and salt, stir well.
Taste and adjust:
Add more lemonade for a brighter flavor
Add more sugar to make it sweeter
Add more lemon zest for stronger lemon flavor and acid
Fold in whipped topping last if you are using it.
Cover and let sit in the fridge for 30 - 60 minutes, it will thicken and the flavors will develop.