No!
Lemon juice
Yes, you can, a nectar is a watered down version of a 100% juice
Yes, as long as you do not use pineapple juice. this prevents the gelatin from setting.
Clarified pineapple juice is a natural pineapple juice which gets filtered to remove the pulp. The taste and texture of clarified pineapple juice is more refined. Many brands prefer to have a clarified pineapple juice for canning purposes.
Pineapple
Lemon Grass if you can find it... You can use real lemon, real lime or bottled lime juice and sometimes pineapple juice will work depending on what you are making. Marcy lime , pineapple and orane hice will all work as long as it is acidid
48oz
Is pectin used in unsweetened pineapple juice
5.6 quarts
yes
1 pineapple
Yes, pineapple juice can be turned into pineapple vinegar. Raw Pineapple Vinegar is made using thinly sliced pineapple, brown sugar, cloves and water. There are several detailed vinegar recipes available on the internet.