Candies like Zots, Warheads, or Pop Rocks
Crunchy foods like chips or vegetables like carrots, cucumbers, celery, etc
Soft foods like applesauce, mashed potatoes, oatmeal, Cream of Wheat, or purees
Food sensory play like graham cracker sand or edible dough
Silicone, wood, or terrycloth are all common options, so don't give up if one doesn't work!
Vibrating tools like the Z-brush
There are adult sized pacifiers for adult-sized people! Click the above link for information and where to find them.
Electric toothbrushes
For teethers or handheld chews, you can attach them with products like this to a stroller, highchair, wheelchair, walker, clothing, or bag. They can also be made into necklaces with breakaway cords, or clip on with pacifier clips.
For food items, make sure the items aren't a choking hazard!
There are adult-sized bibs for drooling or food messes, and they don't have to be boring!
Some examples: flowers, butterflies, tuxedos, or bandanas
For older kids and adults, they make longer bottle nipples, as shown in my pacifier link above.
Sippy cups are an easy way to keep drinks accessible and are great for all ages! I use 360 sippy cups due to motor issues that make it hard to use regular cups, and I don't like to spill drinks on myself. They're also fantastic for sippy-to-cup transitions for kids. I go for the largest available cups so it's as close to a water bottle as possible, but your mileage may vary. Use what helps you!
Weighted cups might be easier to drink from different positions.
For people with low motor control or dexterity, modified cups, bowls, plates, and silverware might be easier. Examples are linked here, but feel free to ask your occupational or speech therapist if you've got one- they're full of good resources.