The most common and most likely answer to this crossword clue is the 8 letter word SWIGGING
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Buddy explains!
The straight part
We know that "drinking from bottle" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case drinking from bottle = swigging.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does SWIGGING mean?
SWIGGING verb- To drink (usually by gulping or in a greedy or unrefined manner); to quaff.
- To suck.
- To take up the last bit of slack in rigging by taking a single turn around a cleat, then hauling on the line above and below the cleat while keeping tension on the line.