Slice the strawberries and lemons into thin slices and place in a water bottle. Tear a few basil leaves and add to the bottle.
If traveling via airplane, keep the ingredients in the bottle just as they are and purchase a bottle of water after going through security at the airport. That way you're able to enjoy your infused water without worrying about the liquid limit! Otherwise, add some water right away and let steep for 5-10 minutes, for the flavours to infuse into the water.