Sea Tea

The Sea Tea (JP: ビチャビちゃ) is a consumable item sold by Gerson in Waterfall. In addition to healing 10 HP, it increases SPEED for the entire encounter.

Additional uses

The protagonist can give a Sea Tea to one of MTT Resort's hotel doors to earn 99G.

Location

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Trivia

The Sea Tea can only increase the speed a maximum of 4 times during one battle. This effectively doubles the speed of the SOUL.
Consuming Sea Tea during Muffet's fight does not yield a speed bonus, explaining that speed is restricted by the web.
The Sea Tea's original description was "A very situational item." according to an Undertale Kickstarter update.^[1]

References

↑ Regular Progress Update, Update #26 April 30, 2015

[1] Regular Progress Update, Update #26 April 30, 2015

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