Here is a riddle from my side. I think it's bit easy.
8 times a day.
97 of the cent useless.
It saves you from death but you can also die within it.
Might cause a war.
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This may provide a solution
8 times a day
There's a saying 'drink eight glasses of water a day'.
The water molecule H-O-H is V-shaped or bent.
97 of the cent useless
97% of the water on Earth is salty ocean water which is not good for drinking.
It saves you from death but you can also die within it
You need water to survive, but may drown in it.
Might cause a war
Water conflict is a serious concern.
Maybe an answer? I'm not sure how this applies to #4 or #5, but it works reasonably well for 1, 2, and 3.
The number $3$
$1/8$ of a day is $3$ hours.
The physical shape of the number $3$ is clearly bent.
Something that is $97$ percent useless is $3$ percent useful.
Again, not sure how this could work for #4 or #5. I'll have to think on it.