I bought a Canon S90 a while back, and it's been with me 24/7 ever since, it's a joy to know that I can pull it out and shoot whenever I feel like it. So, that started me thinking: Can I find a film camera that does the same?
The short answer is - no. And the second question is - why would you want to? If the S90 gives you all you need, then why do you want a film camera? Get off the GAS train. Here's why the answer is no, and I speak from experience. The Fuji F20 is my "S90". I've owned all kinds of rangefinders and other film cameras in search of the "have with me 24/7" camera. This includes the tiny "Konica Auto S3" and the Yashica Electro CC - both fine near-mint samples. Loved using them for a while, they both gave great output -
but- The 24/7 camera does not exist in the film world. Give up the search... You will end up disappointed and running back to your S90.
A. Very few film cameras have collapsable lenses. Your S90 does. This is a major reason you take your S90 with you. What film cameras have collapsable lenses? Retinas? Other obsolete film folders that are 1/2-century old? Fine cameras
in their time - and smaller than the others but these cameras are significantly heavier and bigger than your S90 - you will be well aware of their annoying presence in your pocket - if they even fit. Digital technology
enabled the pocketable camera. This is why your S90 is your 24/7 camera.
A2. See the other cameras recommended here? Fine cameras, sure. They all have lenses that jut out. Forget them, no matter how small they are. These are better options if you don't want to lug an SLR around all day when you're going somewhere. But they're
not "27/7" cameras like your S90 and my F20. I've been down this road before, trust me.
B. Film. Your S90 lets you shoot as many pictures as you want. 100's on a fully charged battery. And I bet there are days you took the digital equivalent of rolls and rolls of film. This is film that has to be purchased, carried, processed, and printed. All of which is
something else that needs to be carried around with you (in addition to the extra bulk of the camera itself...) and the costs of these consumables (and/or time and effort) is not insignificant if you shoot at any volume. Soon you will have rolls and rolls of undeveloped film lying around. You will also be much more selective in what you want to shoot because of the expense. Eventually you will grab your S90 more and more often for this reason.
C. Filters and Flashes. Your S90 has 1. auto ISO (I'm guessing) all the way up to 1600 ISO. It also has auto white balance. A small zoom lens that covers semi-wide, normal, and short-tele ranges. - In addition (guessing) to macro. It has a small built-in flash. In short, you can shoot in any condition with this camera. Color indoors in tungsten light? No problem - reset the white balance. This would require a filter with film. Loss of f-stop, and something else to carry around (or live with the cast). Some of the cameras suggested don't have a flash. Most that
do have flash built-in have slower lenses than the f2.0 on your S90.
In short, you carry your S90 around with you 24/7 because it fits in your pocket without issue, weighs only a few ounces, and is a camera that allows you to shoot unlimited with good quality in any condition. Others will disagree vehemently but NO film camera can give you what the S90 does for the reasons I've outlined. (Don't listen to them - they're zealots. Good folks but film zealots
😉 Digital technology
enabled the "24/7 shoot anytime as much as you want" camera. Therefore, film cameras - every single one of them, is precluded from being that camera. So, the answer to your initial question is "No, there isn't a film equivalent of the fine S90 you already own..."
The recommendations here are all fine cameras. They're not replacements for your S90 in the film world. Shoot these cameras for other reasons, of which there are many. Don't go down this slippery slope. These cameras - after the initial joy of purchase, will wind up sitting on a shelf (or put up for sale) like a kids "gotta have" Christmas toy 6 months after their elation on Christmas morning unwrapping the box.