Combine all —tofu, lemon juice, olive oil, water, tamari, and garlic—in a high-speed blender or food processor.
Blend on high until the mixture is completely smooth and creamy. You may need to pause and scrape down the sides of the container a few times to ensure everything is fully incorporated.
Check the consistency. If making a dressing and it's too thick, add more water, one tablespoon at a time, until it reaches your desired thinness.
Taste and adjust seasoning if needed.
Transfer to an airtight container and store in the refrigerator for up to 4 days.