Fluid Flippers
Smoothies Swim Speed
Fluid Flippers is a smoothie in Grounded. Its effect is Swim Speed. In-game it is described as: "A drinkable sludge that is scientifically proven to make you swim faster."
A smoothie: blend it at a Smoothie Station and its buff lasts a set time, so it is a pre-fight power-up rather than a snack.
The effect it grants is Swim Speed — the reason to craft it is the buff it adds for its duration, not the item itself.
It is made from Water Boatman Fin, Eelgrass Strand, and Lilypad Wax, so topping up your stock of those ingredients is the prerequisite for keeping a supply on hand.
Verdict: Overall Fluid Flippers is a smoothie worth carrying for its Swim Speed effect.
A drinkable sludge that is scientifically proven to make you swim faster.