It seems like you believe the can't-remember-how-to-use-a-straw problem is a cognitive issue. Could it be a muscular issue as well? Along the lines of my-muscles-don't-work-that-way-any-more or my-muscles-aren't-getting-the-right-signals-from-my-brain-any-more? Just a thought....this might indicate that it's a swallowing problem you are dealing with.
People tell me that their loved ones don't have swallowing problems when, in fact, they do! The only way I know of to be sure there's no swallowing problem is to have a modified barium swallow study done. This will tell you if there's SILENT aspiration -- meaning, no one is aware that there's a swallowing problem when, in fact, there is.
So all of that has probably put you off from reading the rest of this post. But here are my suggestions for drinking containers:
* bottle with a lid with a nozzle in the middle of the lid. Liquid can either be squirted out or, in our case, the nozzle is put into the mouth, the bottle tilted up, and the bottle squeezed. We have several from Rubbermaid but despite the advertising they do leak from the lid despite the rubber seal. (see the "Squirt Top Bottle" from Rubbermaid, which you might find by following this link: http://www.rubbermaid.com/rubbermaid/pr ... Prod100022
* cup with a nose cut-out. (see http://www.activeforever.com/ps-305-30- ... t-cup.aspx
* plastic cup with large handle, spout for drinking, and lid. (sorry I don't have a webpage or brand name to reference; I can email you a digital photo of such a cup, if you want.)
* sippy cups from Tupperware. (on www.tupperware.com
do a search for "sipper cups"; the first result is for a "Sipper Seal Set."