Toddler water infection - how to collect sample?

[mjs18]

I think My daughter 2y nearly 3 has a water infection says it hurts when she wees and has a temp.

She's recently started using the toilet... I plan on getting a doctors appointment in the morning but know she won't do a wee on cue at the doctors. I also don't have a sample pot at home she can use...

What can I use to collect a sample?!

I would bring out the potty then put it in the bath and nip up to the surgery for a sample bottle before the app.
Or, I'm sure they would still be able to use it if you take it in a Tupperware container?

Did they not ask you to collect a bottle before tomorrow?

Potty and then some kind of tupperware.