I do the grocery shopping in my house. I use reminders to make my list and check the items off as I shop to make sure I have everything. I'm looking forward to an app that will let me see the list on my watch so that I'm not pulling my phone out 15-20 times.
I have seen iBeacons that work with the watch (in concept) that will alert you that you are near an item on your list. That might be helpful but hope not annoying.
Might be overkill for your needs but My Recipes (yes it's my app, shameless plugging) has what you're looking for and more. Take a look at the page I've linked there's some screens of it on the Watch.