The freebie has been arranged by the west London club as a way to reward fans for their “loyal support” this season.
Fans who enter through the Stamford Bridge turnstiles between 6.30pm and 7.15pm on Wednesday night will be handed a voucher which can in turn be exchanged for a bottle of Singha beer or a bottle of water.
League leaders Chelsea lead fourth-placed City by 11 points and can effectively end Pep Guardiola’s side’s title hopes with win.
However, a second successive loss after their defeat by Crystal Palace at the weekend will allow second-placed Spurs the chance to move to within four points of their London rivals if they win at Swansea.
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How Conte’s season went from bad to brilliant while Guardiola’s started perfectly but fell apart
Chelsea manager Antonio Conte has urged his players to remain calm ahead of City’s visit.
Conte said on Tuesday: “At this moment, I’m pleased with my players. I’m seeing, always, great commitment from my players.
“It can happen. You can lose the game. But we didn’t deserve to win the game against Crystal Palace. But football is wonderful also for this type of result. And tomorrow we’ll have another game.”