Naming it without a problem later
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The ordinary naming work, plus two traps specific to drinks.
Three names to check
Business, brand and each product name, as separate searches, against the trademark register, the domains and the marketplaces.
Beverage names collide more than most because the category is crowded and the vocabulary is small.
Names that are standards
Several words in this category mean something specific: juice, nectar, cider, spring water, mineral water, purified water.
Using one as a brand name does not exempt you from the standard it names, the statement of identity still has to be accurate, and a name that contradicts it is a labeling problem.
Check any word describing what the product is against whether it is a defined term before building a brand on it.
Names that imply alcohol
The trap specific to fermented soft drinks. "Brewed", "hard", "session", "craft", a beer-styled name or a beer-styled label can imply an alcoholic product.
That matters in two directions: it misleads a customer who does not want alcohol, and it invites a regulator to ask what the alcohol content actually is.
Which is a question you want to answer with a laboratory result rather than with a shrug, and if the answer is 0.5 percent or more, the product carries the ABLA health warning and a different label regime entirely.
Before the labels
Search first, print second.
And check the product names against the claim rules at the same time, because a name implying a health benefit is a health claim, and this category makes those more than any other here.