It depends on the dish. However I use White Balsamic Vinegar as a substitute for Lemon juice in salads.
yes
NO
You may, but you may not like the end product. The lemon juice adds acidity like orange juice will that help to prevent spoilage, but lemon juice also contributes to the taste. Orange juice will too, but you may find it much sweeter.
Lime juice can substitute for lemon juice.
Yes it is
yes put the lemon peel in later over night and squeeze the peel in the morning into the water and it will taste like lemon juice
lemon juice
no if you think nothing is impossible
Yes, you can. Make sure you use half or less than what the recipe calls for, don't use it for canning, and don't use it for beverages.
You can use Lime juice, and I think you can use Lemon extract im not sure.
Yes, check the bottle's directions for diluting the concentrate for the equivalent amounts of juice.