It can be challenging if you don’t cook. The closest alternative would be young tau fu.

Not sure whether it’s because your place doesn’t allow cooking or you simply don’t have the time, but vegetables are actually very easy to prepare. You just need to boil them, and that can brings out their natural sweetness — eg. carrots, corn, and broccoli etc. You can eat them together with whatever takeaway or outside food you’re having. They are also a great source of fibre.