The question pretty much states it. Spring Valley K supplements only suggest 1 tablet per day, and it only fulfills 2% of the DV. It’s ~90mg.
It’s actually limited to 99mg due to the risk of small bowel lesions. Anything over 99mg must state a risk for small bowel lesions.
https://www.accessdata.fda.gov/scripts/cdrh/cfdocs/cfcfr/CFRSearch.cfm?fr=201.306
Get potassium bicarbonate. If you can stand to drink it (trick is to dissolve in lots of water), you can easily get over 6g/6,000mg per tablespoon and over 2g/2,000mg per teaspoon.
Cardiac arrest is not an issue since it’s not IV administration. Assuming a well-functioning gut lining and kidneys, you’re fine taking in large quantities orally: the lethal dose is 2,500mg/kg, so there’s just no way that’s achieved by accident or mistake.
Rapid uptake can kill you, I think by stroke. As another user says, you can get potassium chloride at the grocery store, and carefully add some to water, following keto expert advice. If you are not restricting your intake artificially, or increasing demand through dramatic carb restriction, there is likely no need. Avocado and beef are some good ideas.
edit: I should add a note of caution about high sodium intake causing some depletion of potassium. also be careful not to confuse people over vitamin K, a less important nutrient