12. The second Seder in the Diaspora:[1]

All the laws and customs followed on the first night of the Seder are likewise followed on the second night in the Diaspora. [Thus, we do not drink even water after the Seder of the second night.[2] However, we are not particular to eat the Afikoman before midnight on the second night.[3]]

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[1] Admur 481:1; Rama 481:2; Iggur 819 in name of Shivlei Haleket 218

[2] Implication of Admur in Siddur under Tzafon, as learns Rebbe in Haggadah, that one is not to drink anything even on the 2^nd night; Admur ibid “One who eats or drinks after the Seder on the 2^nd night has done no prohibition, although he has removed himself from the group of Mehadrin, and transgresses the words of the Sages who said one is to never remove himself from the Klal.”; brought in Chok Yaakov 481:3; Igur 819; Shivlei Haleket 218; Beis Yosef 481

The letter of the law: On the second night one may rely on the first opinion and drink all non-alcoholic beverages even if it is not a case of great need, as from the letter of the law there is no prohibition at all to eat and drink after the 3^rd and 4^th cup, and it is only the Mehadrin that are accustomed on the 2^nd night like the first night. [Admur ibid; Chok Yaakov ibid]

[3] Sefer Haminhagim ibid; Likkutei Dibburim p. 269; Sefer Hasichos 5701 p. 93; Reshimos 5:19; Hamelech Bemisibo 2:97; Otzer Minhagei Chabad p. 120; So was also custom of Darkei Chaim Veshalom 605; Tzas Viznitz

Other customs: Some are accustomed to eating the Afikoman before midnight on both nights. [Minhag Komrana; Ger; See Admur 481:1]