Board Thread:Questions and Answers/@comment-28050645-20160325024144/@comment-27701762-20160326001040

You're actually probably best off with what you have. The key to Undyne is minimizing the number of times you need to heal and maximizing your chances to attack. Especially given that as the battle wears on, the attacks become more and more intense and tougher to dodge.

The snowman pieces are going to be the best thing to use. Use as Sea Tea if you like, though I've never found it helpful. Focus on learning the patterns for the Green SOUL sections, so that you don't have to stop and heal for them. It takes some time to learn the basic pattern, but you want to get through each time only attacking and taking at most two or three hits. Ideally you want to get to through these sections without being hit at all.

At this point, I'm pretty sure you can't get back to the village. The only vendor you can reach is Gerson.