Question: dark souls 3 how to get more estus?
Answer: Amount of flasks the player carries can be increased using Estus Shard.
The player can carry 15 Estus Flasks total.
Can be reinforced by burning Undead Bone Shard, at the Firelink Shrine bonfire, up to +10. ... 
The Estus Ring increases the amount of health regenerated by Estus Flask by 20%.