Blood Death Knight Tank Gems, Enchants, and Consumables — Battle for Azeroth (BfA) 8.2.5

You should use Leviathan's Eye of Strength in one socket, and Versatile Dark Opal (or the cheaper Versatile Royal Quartz) in all other sockets.

Use Greater Flask of the Undertow for most content — only use Greater Flask of the Vast Horizon if the encounter requires you to have a larger health pool to survive specific spike damage events.

Use both Abyssal Healing Potion and Healthstone as emergency mitigation tools; they do not share a cooldown, and each can be used once per encounter.

Use Famine Evaluator And Snack Table, or Bil'Tong if a feast is not available.

Patch 8.2 brought a refreshing change to the consumables when it comes to potions. Depending on the situation, you will have a choice of two or more potions, without the dependence on RNG that Potion of Bursting Blood had.

• In general, Superior Battle Potion of Strength, Superior Steelskin Potion, and Superior Battle Potion of Stamina are the upgraded "default" potions and will be your go-to whenever you do not see a use case for one of the more esoteric ones. Both provide a hefty amount of Strength (and therefore Armor) or Stamina. You will be using Superior Battle Potion of Strength the majority of the time.
• Particularly in Mythic+, Potion of Empowered Proximity has a cap of 50% more primary stat than Superior Battle Potion of Strength. If you are fighting more than 4 mobs, this is the potion for you. It is a dynamic buff and updates every second with the correct value for the situation you find yourself in.
• Potion of Focused Resolve increases your chance to critically strike your current target at the time of consumption by up to 20%. This is the single-target DPS potion. As we do not have abilities that benefit defensively from critical strikes, this has no real defensive benefit.

If you can afford it, you should use Battle-Scarred Augment Runes to increase your primary stat. Since there is a finite amount of these runes available, you should make sure to use them wisely and to stock up on them for when you need them.