熱水袋真是冬日必備好物！

A hot water bottle is something you must buy to prepare for the winter months.

Source: Tatoeba

Sentence Composition

1 熱水袋 rèshuǐdài hot-water bottle
=2 真是 zhēnshi
  1. indeed; truly
  2. (coll.) (used to express disapproval, annoyance etc)
=2 真是 zhēnshì
  1. (colloquial) Used to express dissatisfaction or annoyance; honestly!
  2. Used other than figuratively or idiomatically: see 真 (zhēn), 是 (shì): (it) really is; (it) truly is
  3. Used to express dissatisfaction or annoyance; honestly!
3 冬日 dōngrì
  1. (Classical) winter sun
  2. (literary) winter
  3. winter
  4. winter sun
4 必備 bìbèi essential
5 好物 hǎowù fine goods