You can easily create a waterproof case for your Camera (Digital Camera, Phone Camera, everything except for DSLR witch you did not mention you had so I am making an assumption.
Based on my assumption, One common method of waterproof DIY is to use a food preserver (Vacuum's the air out then seals it.) This method will work with your camera, phone, anything you need. The beauty of it is, if your use this method for your phone, the audio still can be heard, the touch screen still works, etc... so its 100% adaptable and usable.
If you are using DSLR, you will need to consider a complete enclosure since the lens connects to the base unit.
Here is the Vacuum I am referencing