Instead, use a large jar or a Nalgene, or even a plastic pitcher. You want something with a top that is relatively narrow and ideally something with a lid.
They have actually invented portable bags with sturdy rings that people swear by (I would definitely get some for my car if I had kids or if I were a Lyft/Uber driver).
The general idea is that it's so much better if you can keep your nose out of it and also not worry about splashing.
It's also really convenient to be able to put a lid on it, especially if you're in the car or in a waiting room. (the bags have a way of sort of closing up, which I don't quite understand yet)
On the topic of losing fluids:
Dehydration is a big deal, and is typically a larger threat than the bacterial or viral infection that might be causing the digestive upset. I’ve found Pedialyte to be the most frequently recommended rehydrator at urgent care, and I’ve recently discovered that in addition to the boxes of powdered mix that are easy to store in case of emergencies, they make popsicles that you can keep on hand. They’re not as concentrated, so three pops are needed to compete with a regular pack, but the format is sometimes easier to keep down. I also recommend 40,000 volts from trace minerals—very gross on its own, but you can add a dose to your favorite juice or sports drink, which can be good if you are sensitive to particular types of artificial or natural sweeteners. The dextrose in pedialyte is another selling point for me.
I make bone broth (
For repopulating your gut biome, I’ve heard really good things about Seed as a general probiotic and VSL 3 for more intensive use (seems similar to this which is available for same-day delivery via Whole Foods, if time is of the essence).