Water damage and opening iPhone 5c both puts it out of warranty, so do both?

If having water damage in your iPhone 5c means you aren't covered by warranty, is it acceptable to open it and try to fix it as opening it also means it isn't covered by warranty. Therefore if you can't fix it yourself, apple can still take it out of warranty?

Yes they will be charged under warranty for one year, because they have indicators of contact.

Yes it won't be covered under warranty… Thats one of the main reasons why i would never buy an iphone…