If + Present Simple, Present Simple
General truths or facts
When it rains, the ground gets wet.
If it rains, the ground gets wet.
If you heat water, it boils.
If students study hard, they pass the exams.
If you water plants, they grow.
If it is sunny, people go to the beach.
If it rains, the ground will get wet.
If it rains, the ground gets wet.
If you heat ice, it melts.
If you heat ice, it will melt.
If it rains, I will stay inside.
If it rains, I stay inside.
The zero conditional is used to express general truths or facts that are always true.
No, 'will' is not used in zero conditional sentences; present simple is required.