Well, it's not actually a "custom," but just as it is in most taverns around the world, most izakaya in Japan has a "policy" of a minimum of 1 drink per person, and that drink can be non-alcoholic but should have a price (so the free water or free green tea doesn't count). There's nothing difficult or unusual about it. You can even ask for what "soft drink" they have, and the waiter will be most happy to assist you.
Another thing is that in the recent years, it has been considered rude to force others to drink alcohol. It is even strictly considered so, as it may lead to critical health problems and accidents. Of course, here in Japan, we have our fair share of drunk geezers who try to do everything rude, but that's not the norm nor is it a custom, so just do whatever you'd do in your home country.
obviously (hopefully) socialising with locals.
Do you have plans to party with any specific local? If not, you don't have to worry, because pouring drinks between strangers just doesn't happen. In fact, that would mean you'll be drinking on other people's bills, and it's not at all common to buy strangers more than one drink.
If you do, however, get invited to a party where everyone is expected to know each other for some reason, then it would be a nice gesture to offer pouring drinks to each other. This doesn't necessarily have to be alcoholic drinks. It's just a nice gesture to show that you care about other people's empty glasses.
For example, if someone comes around with a bottle of beer, you might say, "No thank you, I'm drinking wine" or "No thank you, I'm drinking tea." Then that person might fetch you that bottle of wine or tea, and then it is polite to accept that drink, since that's what you said you are drinking. I think similar things would happen at a dinner table in your home country.
I suppose there are times when you don't even want your tea. Then you can decline any offers (apart from the minimum drink policies). But it's also a nice gesture to say, "Perhaps just a little." You can say when to stop having your drink poured, and you can take a sip of that new drink and then just let it stay. I think this is something people do when making a toast in most countries.
Anyway, there's nothing special about it, so no worries.
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