The package does not include the train Zurich to Schwyz, so you can book your own with your Half-Fare Card and benefit from the ~50% Halbtax discount. The Stoosbahn Peak Experience (the funicular up + Fronalpstock chairlift down) is also pax-purchase at the gate (~CHF 49 with Halbtax) — you can buy it together with your train ticket as an SBB RailAway combo on the SBB app for around 10% off.

Saturday lunch in Stoos village, Saturday dinner at the reserved restaurant (you pay your own bill, ~CHF 40-50) and Sunday lunch after the cave tour are also at your own expense, giving you the freedom to order what you fancy. Drinks at the lodge and travel insurance are not covered.

Switzerland is on the higher end for travel costs, but with a Half-Fare Card the train and Stoosbahn are very reasonable. Here's an estimate of common extras:

Train Zurich to Schwyz return (with Halbtax): ~CHF 40

Stoosbahn Peak Experience funicular + Fronalpstock chairlift (with Halbtax): ~CHF 49

Saturday lunch in Stoos village: CHF 25-30

Saturday dinner at the reserved village restaurant: CHF 40-50

Sunday lunch at Hölloch Center or Stoos valley: CHF 20-25

Local beer (0.5L) at the lodge: CHF 6-8

Optional caving overall rental (if you don't want your own clothes muddy): CHF 25