Groceries I don't buy with BTC, because it is not possible. But basically all household items, thanks to several big online retailers accepting BTC in my country. Also all travel related stuff, hotels, flights, etc.
I very rarely use BTC in brick-n-mortar setups, in the last year once in a restaurant where I had a bigger bill and they had recently started accepting it - went actually very fluently.
It is not really that much different lifestyle to any normal life, I just pay with BTC where it works. And these days it works very fluently in online setups in my experience.
The lifestyles not that different, except the relative value of the currency you use on apparently a daily basis has dropped 52% this year? Do you hold bitcoin, or just convert whatever your employer pays you in fiat into btc every two weeks? With a limited number of potential retailers, how do you comparison shop? How do retailers handle pricing and the volatility of bitcoin?
I just don't see how this is at all possible. Like, who are you paying bitcoin to for flights?
But what are the advantages of BTC in these cases? Transaction fees + Processing Times are so high that make it uninteresting for many people.
It feels like translating the real value of something (say $5) to something else (e.g., 0.01 BTC) with every purchase. It's just overhead at this point.
It's life as usual - the biggest mainstream webshops here accept Bitcoin. I can buy anything I want that way - groceries, tech gadgets, kitchen machinery, garden equipment, whatever - with same-day or next-day delivery. The mainstream concert ticket sellers also accept BTC here. Not sure about plane travel, but I can use BTC to buy train tickets.
If I can't use Bitcoin at a store directly, I can simply take out some cash at a nearby Bitcoin ATM - nowadays there's more BTC ATMs than my bank's ATMs.
With Bitcoin directly? You'll be quite limited (though not impossible). If you are looking for non-KYC off-ramps, there are many; especially if you are living in a country where cash is widely accepted. P2P Bitcoin trading is quite widespread, though it requires some due diligence to find reasonable and trustworthy people to exchange with.
For most of your online purchases, you can go with a gift-card; though it's an annoyance compared to just having one single card with rewards and cashback.