M: What liquids should you be drinking if you've had a cough that is non-bacterial or related to a cold for two weeks?

G: [Non-text content: reasoning_recap; content_type=reasoning_recap]

G: TL;DR: For a lingering non-bacterial cough, especially one that may involve irritation or reflux sensitivity, the safest bets are warm water, herbal tea, diluted electrolyte drinks, broth, and honey-containing warm drinks. Avoid things that dry, inflame, or repeatedly trigger the throat.

Good options:

Things that commonly make a persistent irritation cough worse:

If the cough is lingering because of post-viral irritation, reflux, or throat dryness, the main goal is usually:

  1. Keep the throat moist.
  2. Reduce repeated irritation.
  3. Prevent reflux/microaspiration if applicable.

A cough lasting 2+ weeks after a cold is pretty common, but once it gets into the 3–8 week range, doctors often start considering:

日本語(にほんご) first: 温(あたた)かい お茶(ちゃ) と はちみつ は、せき の のど の 刺激(しげき) を やわらげる こと が あります。
— Warm tea and honey may help reduce throat irritation from coughing.

水(みず) を 少(すこ)しずつ 飲(の)む ほう が、のど に やさしい こと が 多(おお)い です。
— Sipping water gradually is often gentler on the throat.