。
I skimped on lodging and slept outside.
Literal
Lodging-fee [object-を] skimped-[and-て] slept-outdoors-[polite-ました].
A budget-traveler confession. ケチる is a colloquial verb derived from the noun ケチ ('miserliness, stinginess') — 'to skimp, to be stingy about.' Productive: ケチ + る gives you a verb. 野宿 ('sleeping outdoors, camping out') is the noun for sleeping rough without proper shelter — distinct from キャンプ (organized camping). 宿代 ('lodging fee') uses 代 for 'charge, fee.'