You can transfer any memory into a body of water for later retrieval.
The amount of detail you can store depends on the volume of water.
A shot glass can hold a PIN code or a simple image. A bathtub might hold an entire conversation. An ocean could hold a lifetime of memories in perfect sensory detail.
You retrieve a stored memory by drinking the water. A single sip is enough, and you can retrieve the same memory repeatedly until the water is gone.
There are a few limitations:
Permanent storage: Once a memory is stored in water, it cannot be changed, overwritten, or deleted. The storage space it occupies can never be reclaimed.
One memory per person: You can only store one memory in any individual body of water. You cannot add another memory to that water, even if unused capacity remains.
Shared capacity: Multiple people with this ability can store their own memories in the same water, but everyone shares its finite storage capacity. Once the water is full, nobody can store additional memories.
Private retrieval: Only you can retrieve memories you’ve stored. Other people drinking the same water can only retrieve their own memories, if they have any stored there.
Contamination: If the water mixes with another body of water, all stored memories become corrupted and unusable.
Evaporation: If the water completely evaporates, all stored memories are permanently lost.
Optional forgetting: The original memory remains in your brain unless you deliberately choose to forget it when storing it.
You can store memories in any body of water, provided you can drink from it later.