It depends on what they have and really need. Like if you know they dont have a lot of linen you could buy linen and just say that you weren't comfortable giving them cash without it being annonymous. If they do plan on having a wishing well though then give what YOU feel comfortable giving. It is rude for them to have an expectation as to what people should give, because a gift is just that and they should be thankful to get anything, especially if you are not in the same position financially that you have been in before.