Tosefta על תרומות 8:4

We [may] take terumah of unboiled wine on behalf of boiled wine, but not boiled on behalf of unboiled (Ter. 2:6). Rabban Shimon ben Gamaliel says, even the boiled on behalf of the unboiled, and furthermore Rabban Shimon ben Gamaliel says, wine that is boiled is no longer subject to [the laws regarding] uncovered liquids (Ter. 8:4) or subject to [the laws regarding] wine of libation (Avodah Zarah 30a:5).

Brine and vinegar and fish brine and oil and honey are exempt from [the restrictions against] exposed liquids, but Rabbi Shimon forbids them. Said Rabbi Shimon, "I saw a snake drinking brine in Sidon." The [Sages] said to him, "That snake was a fool (alt., crazy), and we don't bring proofs from fools" (cf. Shabbat 104b:5).

The water from pickling [terumah], the water from stewing [terumah], the water of [cooked] peas -- they are not subject to the [prohibition against consuming] exposed liquids. The water in which there remains inside it [pieces of] pickles, stew, or peas, if there is [sufficient quantity] in them to impart taste, they are permitted, and if not, they are forbidden. Water in which quince or Damascene plums were rinsed [as a remedy for] a sick person -- they are not subject to the [prohibition against consuming] exposed liquids. Water that was exposed and then heated are forbidden under the [prohibition against consuming] exposed liquids. [However,] hot water, as long as it is steaming, is not subject to the [prohibition].

[With respect to] a spring, as long as it flows, the prohibition of exposed liquids does not apply, said Rabbi Yishmael son of Rabbi Yochanan ben Berokah. It so happened that Rabbi Yochanan ben Berokah went down to visit Rabbi Yochanan ben Nuri in Beit She'arim, and he came across a pool that did not have three logs [of water in it], and he kneeled down and drank from it. (See Y. Ter. VIII.3.29).) [However, exposed] wine, whether in vessels and whether in the earth, is forbidden.

It so happened that a dead snake was found in a wine cistern and they came and asked Rabbi Yehudah ben Bava, and he [ruled that] the cistern remained permissible [as the] wine was fermenting. As long as it is still fermenting, it is not subject to the prohibitions of exposed liquids (Sanh. 70a:10). And how long does it ferment? Three days.

Terumah wine may not be used to make aluntit (see Tos. Terumot 9:8), and may not be used to make anumlin (=אנומלין, wine mixed with honey, see Jastrow), and he may not discard [the wine that] remains in the cup with his hands, and a woman may not give it to her [non-Kohen] son. Rabbi Shimon ben Gamaliel says, terumah wine that became impure or that was exposed [to snake venom, see Tos. Terumot 7:20], one may pour it out, and repeat the process, and need not be concerned.