Start by soaking the almonds for at least 12 hours or overnight.
The water tends to get brown and mucky, so make sure you refresh it at least once. Once soaked, drain the nuts and tip them into a blender. Discard the soaking water, add the fresh water and blend until you have a lovely frothy milk.
Line a sieve with a muslin cloth (cheesecloth), or use a nut milk bag or a fine st