Food and Water are survival mechanics in Subnautica 2. They are stats which steadily deplete when playing on Survival Mode. The player must maintain their hunger and thirst levels by consuming food and water items. If either stat reaches zero, the player will lose health until they die.
Sustenance is a category of consumable items crafted from certain materials and fauna using the Fabricator. While fish can be eaten raw, using the Fabricator will increase their nutritional value and remove their dehydration penalty.
To consume an item, press the "Use" keybind while the item is selected in the PDA. Some foods will also heal the player when consumed.
Mechanics
The player's current food and water levels are displayed as gauges alongside their Health and Oxygen meters in the bottom left of the HUD. The gauge corresponds with the stat's current value, which ranges from 0 to 100 points.
In Survival Mode, the player loses 1 unit of Water every 15 seconds and loses 1 unit of Food every 21 seconds. Biomods such as Water Retention and Slow Metabolism can help with Food and Water efficiency.
List of Items
Prepared Meals
| Icon | Item | Food | Water | Health |
|---|---|---|---|---|
 | Sugar of Saturn | +10 | ||
 | Halfmoon Jerky | +40 | ||
 | Threemoon Temaki | +60 | +15 | |
 | Hoverthorn Souvlaki | +40 | ||
 | Cherimoya Chutney | +40 | ||
 | Pavlova | +80 | +70 | +10 |
Cooked Food
| Icon | Item | Food | Water | Health |
|---|---|---|---|---|
 | Cooked Halfmoon | +25 | ||
 | Oily Salad | +20 | ||
 | Cooked Harvestmoon | +30 | ||
 | Cooked Bluemoon | +25 | +5 | |
 | Cooked Quadrate | +30 | ||
 | Cooked Geordie | +30 | ||
 | Cooked Electric Geordie | +30 | ||
 | Cooked Hoverthorn | +25 | ||
 | Cooked Blackthorn | +30 | ||
 | Cooked Pneuma | +40 | ||
 | Nutrient Block | +40 | ||
 | Coral Mash | +65 |
Uncooked Food
| Icon | Item | Food | Water | Health |
|---|---|---|---|---|
 | Halfmoon | +15 | -5 | |
 | Harvestmoon | +20 | -5 | |
 | Bluemoon | +10 | +5 | |
 | Geordie | +20 | -5 | |
 | Electric Geordie | +20 | -10 | |
 | Hoverthorn | +15 | -5 | |
 | Blackthorn | +15 | -5 | |
 | Pneuma | +25 | -5 | |
 | Water Slug | -5 | +15 | |
 | Cherimoya Rotsac | +10 | +5 | |
 | Coral Shavings | +3 | -1 | |
 | Deepwing Egg Clump | +40 | +40 | |
 | Flash Slug | +20 | -10 | |
 | Algae Block | +5* |
Water
| Icon | Item | Food | Water | Health |
|---|---|---|---|---|
 | Isotonic Water | +55 | ||
 | Water | +40 | ||
 | Filtered Water Packet | +5* |
- An Algae Block or Filtered Water Packet in the player's inventory gains +5 Food or Water respectively each time their associated Biomods activate.
