They would get a very strange tasting tea, but it would be harmless.
Apple juice
nothing
If you put proxide on an apple it will wilt or it will sink in and make the apple brown.
It can damage your voice.
Your clothes would get cleaner.
it will explode
I barely know.
Since there is not any gravity in space, the apple pieces would start floating around.
not produce fruit
There will be no human
The salt would dissolve, which you can reverse by boiling the water.
The ink would mix into the water and become diluted.