More water than you think, at least 2 litres per person for half-day hikes. Good hiking boots with grip, especially for Masca and Teide.
Sun protection, hat, and layers because temperature swings are real at altitude. A fully charged phone with offline maps downloaded, signal’s patchy in the mountains.
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Snacks that won’t melt in your pack. A light wind breaker even in summer, it gets surprisingly cold above 2000 metres. Leave valuables in your accommodation, not the car.