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If the fast of Tisha B'av comes out on Sunday, is it a problem of preparing for after Shabbos on Shabbos to eat or drink more than one normally would on Shabbos?

If a fast were on Tuesday, and one wanted to begin increasing their hydration on Shabbos, would that be any better (since the link between the two is ostensibly less obvious)?

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Why would you think it is a problem? – user6781 Aug 1 '14 at 2:48
Sounds like taking a nap on Shabbat 5 Sivan. – Double AA Aug 1 '14 at 2:48
@user6781 I think I explained that in the question. "preparing for after Shabbos on Shabbos" - S.A. 503:1 – Y ez Aug 1 '14 at 2:52
עונג שבת might cover that, see #3 here – LiquidMetal Aug 1 '14 at 3:00

Sh'miras Shabas K'hilchasah 28:77 (my own translation):

When the ninth of Av comes out on Sunday, it's permissible to eat and drink more than usual at the third meal on Shabas, even if his intent is to ease the fast, but he should not say that he's eating for that purpose.

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