Was the light out? Fish sleep in the dark. If it still lethargic in the daytime, change some water (use dechlorinator (Prime) and match the temperature of the old water). To keep a fish alive in such a small container even for a short time, you may need to give it clean water every day. See if you can find a large plastic storage bin or tub that you can use as a makeshift tank to give the fish some space.
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