I have a terrific salad bowl that I use all the time. Where it was originally joined, on the side, has begun to separate slightly - enough for dressing to seep out. I need advice on which food safety adhesive to use.
I need advice on which food safety adhesive to use.
The problem you face is that no adhesive will bond to wood that has been in contact with oil, and of course most salad dressings contain a lot of oil. You won't be able to just push some glue into the crack and clamp it for a while. Even without the oil problem, it can be difficult to work glue all the way into a crack, so a simple glue repair might not work. The right way to repair this bowl would be to cut the cracked area and glue in a new piece of wood, and then shape the new piece to match the rest of the bowl. People do that kind of thing sometimes (here's an extreme example), but it'd be a fair amount of work and it might not be what you want if you enjoy the bowl in its current form.
I think your best bet is to leave the bowl alone and put it to some new use that doesn't require holding liquid: fill it with fruit, use it for nuts around the holidays, collect your spare change, etc. Then splurge a little on a great new salad bowl.
And to answer the question that you actually asked, if you need to glue clean edges of wood together with something that's water resistant and food safe, Titebond II and Titebond III are good choices. Titebond III is more water resistant than II, but either one should work well, and both are FDA approved for "indirect contact" with food (i.e. they're good for things like cutting boards and bowls).