To survive as best as you can in Elden Ring, keeping your flasks topped up is imperative, and they fortunately refill whenever you rest at a Site of Grace.
There are two types of flasks you can use, Flask of Crimson Tears (red) for recovering HP, and Flask of Cerulean Tears (blue) for recovering FP that is used for abilities like weapon skills and summoning ash spirits.
Source – eurogamer.net
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