question about a possible UTI

I hope this is the right place to post. I have a feral female. She really is a sweet heart. She has always stayed close to the house. The other day she left and was gone for almost 3 days. She came home and has been acting funny. I brought her into the house because she was acting like she was in shock. I couldn't find anything that would indicate any problems on her. I saw her squatting to pee and she started to pee. I lifted her into the litter box and she just kept on peeing. It didn't seem to bother her that I moved her. Then later she peed on the carped again. She is an outdoor cat so I don't think she understand the litter box. I put her out today so she could go and DH saw her pee and poop then throw up. We brought her back in and she just want to hide in the corner. I think she has an UTI. All vets are closed. what can I do until Mon. when I can get her to the vets? Any and all suggestions are appreciated. I understand you are not vets, but I need some ideas to make her comfortable until I can get her in.

Mary

Sounds pretty bad and probably not UTI. You should keep her in a carrier or cage until you can bring her to the vet and separated from any other cats you have. Disinfect the areas she's been in the house. Wash your hands after handling her too.
Put some food and water while she's confined and check if she eats and drinks. Remove food dish after an hour or so.