This is the mod I use and have always used. Its nice, simple and looks like it's part of the original HUD. If you only want food and water displayed then just look for the "Simple UI Left HUD No Temp" mod. I have this installed on my server and it automatically pushes to client, but since it only displays thirst/hunger info then I assume it will work fine on client side even if the server doesn't have it installed. Someone will correct me if I'm wrong on that. Good luck!