Task prompt: Giver persona: I am a 3rd-year undergraduate student living in the United Kingdom, studying engineering. I live off campus and share a flat with another student, who is also my friend, and I want to purchase a gift for her because she recently passed one of the hardest math exams.

Recipient persona: My friend is a 21-year-old full-time university student who is active in sports and needs a water bottle for daily use on campus, during commutes to university and home, and at the gym. Her previous bottles had issues: one plastic bottle deformed with hot water; another had a lid that didn’t seal properly, causing leaks/water drips that damaged notebooks. She is also very selective about the bottle material to ensure it is non-toxic. Currently, she doesn’t have a bottle, so she buys bottled water from supermarkets daily, which is inconvenient to carry while commuting. I want to get my friend a gift of a water bottle that would eliminate the issues she faced in the past. 

Prompt: Recommend three concrete options of water bottles that I could get for her within a £50 budget. Please explicitly state whether each of your product recommendations meets each of the product requirements that I want. Include the source or purchase links, and prices if applicable.

Evaluation criterion (Meets product/vendor feature; applies to: Product): Recommends only water bottles with at least one portability feature (such as a strap, handle, clip, etc.)
Grounding check: Grounded