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According to Nutritional Management of Kidney Stones (Nephrolithiasis) ( Clinical Nutrition Research, 2015), these dietary measures can help reduce the risk of kidney stones:

• maintaining healthy weight
• sufficient water intake (~1.5-2 liters/day or more when sweating a lot)
• low sodium intake (2-3 g sodium/day)
• high potassium intake (>3 g/day; in fruits and vegetables)
• high calcium intake (at least 1 g/day)
• low intake of animal protein
• only moderate intake of vitamin C (<1 g/day; avoiding vitamin C supplements and fruit juices as a source of fluid)
• low oxalate intake - for oxalate stones (avoiding spinach, rhubarb, potatoes, nuts)

In the context of preventing kidney stones it is enough to reduce sodium intake to 2-3 g/day (5-7.5 g salt/day) (Clinical Nutrition Research).

According to Nutritional Management of Kidney Stones (Nephrolithiasis) ( Clinical Nutrition Research, 2015), these dietary measures can help reduce the risk of kidney stones:

• maintaining healthy weight (probably the strongest effect)
• sufficient water intake (~1.5-2 liters/day or more when sweating a lot)
• low sodium intake (2-3 g sodium/day)
• high potassium intake (>3 g/day; in fruits and vegetables)
• high calcium intake (at least 1 g/day)
• low intake of animal protein
• only moderate intake of vitamin C (<1 g/day; avoiding vitamin C supplements and fruit juices as a source of fluid)
• low oxalate intake - for oxalate stones (avoiding spinach, rhubarb, potatoes, nuts)

(American Family Physician) recommends limiting sodium intake to 2 g/day (5 g salt/day).

You may go a week on a sodium-free diet, but possibly more or less, depending on the loss of salt with sweat:

The classic study by McCance in 1936 was among the first experimental investigations of the effects of sodium deficiency in humans [25]. Using sodium-free diets and sweating, it took about 7 days to make subjects sodium deficient. The experiments were carried out over 11 days, therefore all of the effects reported were present within the 4 days of sodium deficiency. The participants reported that they experienced extreme, unquenchable thirst. *(Physiology & Behavior, 2008)

You may go a week on a sodium-free diet, but possibly more or less, depending on the loss of salt with sweat: Salt craving: The psychobiology of pathogenic sodium intake, Physiology & Behavior, 2008:

The classic study by McCance in 1936 was among the first experimental investigations of the effects of sodium deficiency in humans [25]. Using sodium-free diets and sweating, it took about 7 days to make subjects sodium deficient. The experiments were carried out over 11 days, therefore all of the effects reported were present within the 4 days of sodium deficiency. The participants reported that they experienced extreme, unquenchable thirst.

According to Nutritional Management of Kidney Stones (Nephrolithiasis) ( Clinical Nutrition Research), these dietary measures can help reduce the risk of kidney stones:

Can the body rely on some sodium reserves during the time it takes to get rid of the intruder? (meaning no salt diet)

Most healthy people have so much sodium stored in the body that could probably be fine without any sodium intake for 2-3 weeks or a month, for example, as part of total water fast. But this cannot be made into an advice, because there can be some rapid sodium loss through sweating, so zero-sodium diet is not an option. Anyway, such a short zero-sodium diet would very unlikely have any meaningful effect on kidney stones. And, again, diet does not cure the stones that have already developed.

In the context of preventing kidney stones it is enough to reduce sodium intake to 2-3 grams (which is 5-7.5 g salt) per day, as mentioned above under 3) and further explained in the linked article.

According to Nutritional Management of Kidney Stones (Nephrolithiasis) ( Clinical Nutrition Research, 2015), these dietary measures can help reduce the risk of kidney stones:

Can the body rely on some sodium reserves during the time it takes to get rid of the intruder (meaning no salt diet)?

You may go a week on a sodium-free diet, but possibly more or less, depending on the loss of salt with sweat:

The classic study by McCance in 1936 was among the first experimental investigations of the effects of sodium deficiency in humans [25]. Using sodium-free diets and sweating, it took about 7 days to make subjects sodium deficient. The experiments were carried out over 11 days, therefore all of the effects reported were present within the 4 days of sodium deficiency. The participants reported that they experienced extreme, unquenchable thirst. *(Physiology & Behavior, 2008)

Such a short zero-sodium diet would very unlikely have any meaningful effect on kidney stones; long-term zero-sodium diet is not compatible with life.

In the context of preventing kidney stones it is enough to reduce sodium intake to 2-3 g/day (5-7.5 g salt/day) (Clinical Nutrition Research).