Preserve cut potatoes
It's pretty normal in many cultures to prepare vegetables for the evening meal in the morning, or even the day before. This has a long recorded history, at least to Roman times

Typically, vegetables that brown badly in that 24 hour period are either stored under water, or coated with a suitable dilute acidic solution (orange, lemon, or lime juice)

Cut potatoes stored underwater do not seem to suffer any detrimental effect over a 12 to 24 hour period. There will most likely be some starch and other nutrient loss to the water, but not to a level that anyone notices