Well, Biden didn't go to Saudi Arabia to 'beg' them to increase or maintain production. He went to try to keep them from joining BRICS, from helping create a new gold-backed (and other commodities) currency, from ditching US protection for Russian/BRICS protection, and prevent them from starting to sell oil around the world in other major currencies.
If the Saudis start selling oil in other major currencies besides exclusively the US Dollar, the 'petro dollar' is over, all the counties holding USD purely to buy oil will sell/trade off their USD, and 'reserve currency' status will end.
The Saudis will likely announce opening up sales for other currencies relatively soon, once officially in BRICS, etc.
The foreign dollars will all come home, causing hyperinflation. Rather than doing anything that benefits the people, the Fed Reserve will likely end the USD, and go to a new somewhat-gold/commodities-backed DIGITAL dollar. We won't be able to protest or fight it. Holding onto our old USD will have zero benefit. Companies will only pay employees in the new digital dollar, and fixed income people will only receive digital as well. All the excuses to switch to a digital dollar will be in place, and it won't be preventable.
We'll all hurt hard financially, but things will likely be kept stable enough besides. Also, the US is a net food exporter. Even during the Great Depression, there were like 55 starvation deaths in 5 years.
I don't know what this will do to house loans. I hope I can keep my house, but I doubt it. It'll likely be claimed by the bank. 'You will own nothing and you will be happy.'
Precious metals would be a good value holder... but I'd think they'll let us turn in our domestic USD for new digital dollars, blocking the influx of foreign USD.
I don't think you'll need a water filter...