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Please make sure to give the caged bird water and food every day.
Literal
Cage [possessive-の] bird [locative-に] water [and-と] food [object-を] every-day give [that-ように] do-please.
An instruction to a pet-sitter. 籠の鳥 ('caged bird') is a simple noun phrase, but also evokes a well-known metaphor for someone trapped in unfortunate circumstances. まいにち ('every day') written in hiragana — could be for childlike simplicity or stylistic softness. ~ようにする ('to make sure to X, to arrange to X') is a common pattern for ongoing directives. まく is a rare reading — here 撒く ('to scatter/sprinkle') extends metaphorically to feeding a bird.