Similar to the messages used in The Machinist to jog memory, you can create a "Daily Discovery" board or notebook using colorful adhesive notes to document small daily wins or shared memories.
Examine the film as a "romantic loop" where the tropical setting of Hawaii acts as a "non-place" that allows for constant repetition without narrative inconsistency.
In the film, Henry (Adam Sandler) creates a daily routine to help Lucy (Drew Barrymore) remember their life. You can replicate this with a handmade physical journal: