It hits 98 tomorrow and you are outside all day

5 things, already decided.
Work down the list. Tick off what you own. Every option opens on Amazon, where the current price and the real delivery date live — we never print a price here.
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1. 01 of 05
   I already have this

   An electrolyte drink mix

   Sweat takes salt out of you, not just water. Drink only water all day and you can end up flat, headachy and cramping even though you drank plenty.

   What to check before you choose. Look at the sodium per serving. A mix built for heat carries a few hundred milligrams; a flavour powder carries almost none. Single-serve sticks travel better than a tub.

   Ultima Replenisher Original Variety Electrolyte Packets, 20 Stickpacks | Daily Zero Sugar PowdeCheck price on Amazon paid linkTREVI Electrolytes Powder Packets, Sugar Free Hydration, Favorites 20 Pack | Essential Daily DrCheck price on Amazon paid linkVenture Pal High Sodium Sugar-Free Electrolytes Powder Packets, 16 Sticks | Hydration Packets wCheck price on Amazon paid link

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2. 02 of 05
   I already have this

   A bottle that keeps water genuinely cold

   Cold water gets drunk. A warm bottle in a hot car gets carried around all day and comes home still full, which is how people end up short.

   What to check before you choose. Double-wall vacuum stainless is the part that does the work. Check the mouth is wide enough to take ice cubes, and that you can drink from it one-handed.

   Owala Marvel FreeSip Stainless Steel Water Bottle 32 oz Swing of ThingsCheck price on Amazon paid linkOwala FreeSip Tumbler Stainless Steel Water Bottle 40 oz Daybreak | Triple-Layer Insulation | LCheck price on Amazon paid linkPOWCAN 32 oz Insulated Water Bottle with 2-in-1 Straw and Spout Lid, Keep Cold 24H, Leak-Proof,Check price on Amazon paid link

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3. 03 of 05
   I already have this

   A cooling towel

   Wet it, wring it out, put it round your neck. The water evaporating pulls heat straight out of the blood heading to your head. It works in about a minute and it is reusable all day.

   What to check before you choose. Length matters more than the marketing - you want one that actually wraps a neck rather than sits on it. Check it comes with a case if it is going in a bag wet.

   Sukeen 4 Pack Cooling Towels (40"x 12"), Cooling Neck Wraps, Soft Ice Towel | Lightweight,AbsorCheck price on Amazon paid linkSukeen Cooling Towels(40"x12") for Neck & Head, Soft Breathable Chilly Towel for Yoga, Golf, GyCheck price on Amazon paid linkFROGG TOGGS Chilly Pad, Instant Cooling Towel, Long Lasting, Reusable, Sports and Outdoors NeckCheck price on Amazon paid link

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4. 04 of 05
   I already have this

   Electrolyte tablets for the bag

   This is the backup that lives in a glovebox, a work bag or a stroller. It does not melt, does not spill, and it is there on the day you forgot the powder.

   What to check before you choose. Tubes seal better than loose sachets. Effervescent tablets need a bottle of water to dissolve into; chewables do not, which matters if you are away from a tap.

   Pedialyte Sport Pro Electrolyte Powder | 6 Key Electrolytes for Muscle Support | Fast HydrationCheck price on Amazon paid linkPedialyte Electrolyte Solution, Strawberry, Hydration Drink, 12 bottles, half liter eachCheck price on Amazon paid linkNuun Sport Electrolyte Tablets Lemon Lime, GF & Vegan, 4 PackCheck price on Amazon paid link

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5. 05 of 05
   I already have this

   Broad-spectrum sunscreen

   A heat day is a sun day. Burnt skin holds heat and stops sweating properly, so a burn on day one makes day two considerably worse.

   What to check before you choose. You want the words broad spectrum and SPF 30 or higher. A stick is easier for face and ears; lotion covers arms and legs faster.

   Neutrogena Beach Defense Sunscreen Lotion SPF 50, 6.7 fl oz | Face & Body, Broad Spectrum UVA/UCheck price on Amazon paid linkNeutrogena Hydro Boost Water Gel Sunscreen SPF 50, 3 fl oz | Face & Body Sunscreen Lotion, HydrCheck price on Amazon paid linkNeutrogena Ultra Sheer Dry-Touch Sunscreen Lotion SPF 55, 3 fl oz | Face & Body, Lightweight NoCheck price on Amazon paid link

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Every option above is a real product listing on Amazon, chosen by research, not by testing. We do not own these products and we have not tried them. Prices and delivery dates live on Amazon and change constantly, so we do not print them here.