E. We use in case to talk about things we should do in order to be prepared for possible future situations.
E1. Do not use will after in case. Use a present tense for the future.
E2. We don’t use in case to mean ‘if’. (e.g. Let’s take our swimming costumes in case there’s a pool at the hotel. = We don’t know if there is a pool there. Let’s take our swimming costumes if there’s a pool in the hotel. = We will wait until we know about the pool before we decide.)
E3. can use in case + past to say why somebody did something.
E4. In case of is not the same as in case. In case of ~ = if there is ~ (especially on notices etc.)