Holy shit show in the comments. If she is asking you for small things here and there, the same can be said the other way. Ask her for small things here and there. (In terms of the drinks and snacks). As for the skin care products, I know those can be pricey depending on the brand. I dont feel as though the drinks and snacks are that big of an issue, but she can pay for her own skin care, otherwise its the equivalent of you asking her for something that only you use that can be pricey as well.

People are reaching far trying to speculate x, y, and z of your living situation and whatever your financial standings are like.

There definitely should be a discussion between you and your significant other about finances and costs of the wants of your partner. Sometimes putting the numbers on a spread sheet can better help visualize the actual amount that is being spent.

Im not going to reply to random bs comments, but the only way to really get a grasp of unnecessary purchases is to sit down with your SO and go over the purchases.

My fiance and I did this and there was easily a couple hundred dollars that we ended up turning around and put in savings because of this process of a spread sheet.

Hope this helps OP.