I'm not sure this topic exactly fits into 'food as medicine' but it deals with a medical need for straws to assist drinking in some vulnerable members of society. People with disabilities may not be able to drink well without a straw, old people, little kids.
With the growing societal opposition to plastic straws, straws are becoming harder to find at restaurants and it wouldn't surprise me if they were no longer available for sale in stores at some point. As a person concerned about the environment and the frivolous use of oil-based resources I see this as a positive thing; as the parent of an adult with disabilities it is a bit concerning. One can certainly buy and carry around 'permanent' straws made of a variety of materials - stainless steel, glass, acrylic, silicone. But those require resources to construct too, and can be expensive. There are a number of plants that can be used as substitutes for plastic straws. I thought it would be useful to start a list of these plants.
1. Wheat straw. The original straw. Not suitable for gluten-allergic individuals, but possibly other grasses with hollow stems would be ok.
2. Angelica stems
3. Bamboo stems
4. Castor bean stems. This one surprised me as I thought all parts of the castor bean plant were toxic.
https://www.deccanherald.com/spectrum/a-plant-substitute-for-plastic-straws-793481.html
5. Reeds
6. Sugar cane
What other plants might work? I know there are supposed to be some twigs that have a soft pith in the middle that can be poked out to make whistles - would any of those work as straws?