Caffeine does help a plant grow faster. If you put coffee grinds on some of your plants, it's very healthy for them. Water also helps keep plants alive, so you would still need to do that.
No, most plants will not grow at all in salt water.
water water
No it can not because it has sugar and caffeine. Water might grow it back, though.
well plants grow better in regular water but if they get any water they will still grow
Plants having water have turgid cells. Turgidity helps in cell division as well as cell elongation. Hence these plants grow faster than water scare plants.
fertilizer
yes
No
Caffeine has minerals like potassium are often found alongside caffeine when it occurs in plant sources like coffee beans, and that could help the plant grow faster. But the cafffeine itself would be unlikely to have any affect on the plants rate of growth.
yes usually when plants are given warm water the grow better and comparatively faster
boiled water