Do I need both tokens to provide liquidity?
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It depends on the version and the chosen price range.
v2 requires both tokens in equal value — there is no range to configure, so both reserves must be supplied.
v3 allows single-token deposits when the position's price range lies entirely above or below the current spot price. A range above spot requires only token0; a range below spot requires only token1. If the range straddles the current price, both tokens are needed in the ratio dictated by the spot price's position within the range.
Positions deposited with a single token are out of range at creation and will not earn fees until the spot price enters the specified range. See Single-sided liquidity and Out-of-range positions for details.