A popular choice for Bedrock Edition users.
While the "Night Vision Potion" exists in-game, it requires brewing ingredients (Golden Carrots and Nether Wart) and has a limited timer. A texture pack provides the same effect permanently and for free. How to Install a Night Vision Texture Pack nightvision texture pack
Look for reputable sources like CurseForge or PlanetMinecraft. Search for "Fullbright" or "Night Vision." A popular choice for Bedrock Edition users