"Oh, the food does not disappear, it simply spoils after two days. So as long as you eat it before then, there is nothing to worry about, and you will easily be able to tell once the food has gone bad."

Once they reach the nest, Thaum retrieves a few jars from his bag, making sure they are the ones with wide openings and bottoms, and invokes Undine, filling the jars with food paste or water. The paste is not much to look at, though given what Nahscha feeds her young, that will most likely not be an issue. "What do you want it to taste like?" And he does his best to recreate the taste with a prestidigitation.

"We will take a look at the Wisp. Thank you for the safe passage, Nahscha."

Spoiler: Actions
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As promised, Thaum retrieves some jars and casts create food and water, creating enough food and drink to feed 24 medium-sized creatures for a day. Large-size creatures counts as three medium-sized creatures for this. He then casts purify food and drink and the food to make it last two days, as per the former's spell description.

Spell slots
Lv 0: 1/6
Lv 1: 6/8
Lv 2: 0/7
Lv 3: 1/6
Lv 4: 2/5

Healing Hands pool: 15 / 80


Spoiler: Table of party HP and effects
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Name HP Effects
Aned 54 / 60 Mass resist energy (resist lightning 20, 80 minutes), water breathing (16 hours)
Coney 53 / 53 Mass resist energy (resist lightning 20, 80 minutes)
Larimar 41 / 43 Mass resist energy (resist lightning 20, 80 minutes)
Rina 54 / 54 Mass resist energy (resist lightning 20, 80 minutes)
Thaum 50 / 50 Mass resist energy (resist lightning 20, 80 minutes)
Zanthia 25 / 25 Mass resist energy (resist lightning 20, 80 minutes)