Samata don't panic. When you run out, as everyone says, you can get your brand of milk in Coop and lots of pharmacies.
If you can't bribe your relatives to cart kilos of milk powder out when they visit (none of mine would so I'm mildly amazed at the lengths some people are managing to go to

) then being in Zug you are perhaps an hour drive from Germany where you can buy cheap milk (Aptamil) and nappies to your hearts content. Plus lots of cheaper baby stuff (to say nothing of cheaper everything stuff) so I am sure it will be not be so tough to make a trip once every couple of months or so to keep stocked up.
But if you were intending only formula feeding and only buying your formula in CH, yes, it will bankrupt you (around 24 Chf give or take for a tub).
One thing you cannot get in Germany or here is ready made tetrapaks of formula suitable for young babies (I think the ready made starts at about 6 months, definitely at 1 year and its usually in big bottles). I used to get my Father to bring a few cartons by buying it at Boots once through passport control in the UK. In the end, I ended up throwing it out as you just get used to what you've got and I forgot all about the convenience of these little boxes.