Jerusalem Talmud Shabbat 22:4

משנה: נוֹתְנִין תַּבְשִׁיל לְתוֹךְ הַבּוֹר בִּשְׁבִיל שֶׁיְּהֵא שָׁמוּר וְאֶת הַמַּיִם הַיָּפִים בָּרָעִים בִּשְׁבִיל שֶׁיּוּצַּנּוּ וְאֶת הַצּוֹנִין בַּחַמִּין בִּשְׁבִיל שֶׁיֵּחַמּוּ. מִי שֶׁנָּֽשְׁרוּ כֵלָיו בַּדֶּרֶךְ מְהַלֵּךְ בָּהֶן וְאֵינוֹ חוֹשֵׁשׁ. הִגִּיעַ לֶחָצֵר הַחִיצוֹנָה שׁוֹטְחָן בַּחַמָּה אֲבָל לֹא כְנֶגֶד הָעָם׃ MISHNAH: One may put food in a cistern for preservation¹⁵In all cases mentioned in this sentence, the materials to be cooled or warmed are in a separate container., and potable water into bad one to cool, and cold water into hot to warm it. One whose garments became soaked on the road walks in them without worry¹⁶The water absorbed by his garments are part of the garment, not a load.. If he comes to an outer courtyard he puts them out to dry in the sun¹⁷Even though drying by artificial means is forbidden. but not in public¹⁸That it should not look as if he washed on the Sabbath..